Fixes and improvements from Anthony Asterisk

- First in 8051def.h,  it appears the uip_arch-asm.S file was copied from z80 and am unsure it will work properly.  I modified the 8051def.h to prevent the UIP code from using these routines.
- In dma.c the config routine provides access to all of the DMA channel options, except for the word mode flag.  In order to maintain compatibility with any existing code I created a second routine and converted the original routine into a wrapper routine with a fixed word mode value.
- uart.c::uart0_init was missing blocking access to the higher baud rates.  I am not sure why, so I corrected this.
- I also copied over to header files that provide some useful macros from the msp430 cpu.  The files are lpm.h and hwconf.h.  The lpm.h is for switching power modes, I think.  The hwconf.h has various macros for configuring port I/O.  By porting these files the led/button api's can be ported with minimal modifications.

cpu/cc2430/dev/lpm.h

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2005, Swedish Institute of Computer Science
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * @(#)$Id: lpm.h,v 1.1 2009/12/22 09:28:15 zdshelby Exp $
+ */
+#ifndef __LPM_H__
+#define __LPM_H__
+
+#include <io.h>
+#include "contiki-conf.h"
+
+#ifdef LPM_CONF_ON
+#define LPM_ON LPM_CONF_ON
+#else
+#define LPM_ON LPM1
+#endif /* LPM_CONF_ON */
+
+#ifdef LPM_CONF_OFF
+#define LPM_OFF LPM_CONF_OFF
+#else
+#define LPM_OFF LPM1_EXIT
+#endif /* LPM_CONF_OFF */
+
+#define LPM_SLEEP() do { if(lpm_status == LPM_STATUS_ON) LPM_ON; } while(0)
+#define LPM_AWAKE() do { if(lpm_status == LPM_STATUS_ON) LPM_OFF; } while(0)
+
+extern unsigned char lpm_status;
+
+void lpm_on(void);
+void lpm_off(void);
+
+#define LPM_STATUS_OFF 0
+#define LPM_STATUS_ON  1
+
+
+#endif /* __LPM_H__ */