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/uart.c

@@ -13,9 +13,19 @@ static int (*uart1_input_handler)(unsigned char c);
 void
 uart0_init(uint32_t speed)
 {
-  if(speed != 115200) {
-    return;
+  if(speed == 115200) {
+    U0BAUD=216;	/*115200*/
+    U0GCR =11; 	/*LSB first and 115200*/
   }
+  else if(speed == 38400) {
+    U0BAUD=59;	/*38400*/
+    U0GCR =10; 	/*LSB first and 38400*/
+  }
+  else if(speed == 9600) {
+    U0BAUD= 59;	/* 9600 */
+    U0GCR = 8; 	/*LSB first and 9600*/
+  }
+  else { return; }
 
 #ifdef UART0_ALTERNATIVE_2
   PERCFG |= U0CFG;	/*alternative port 2 = P1.5-2*/
@@ -39,20 +49,6 @@ uart0_init(uint32_t speed)
   P0DIR &= ~0x14;		/*CTS & RX in*/
 #endif
   
-  if(speed == 115200) {
-    U0BAUD=216;	/*115200*/
-    U0GCR =11; 	/*LSB first and 115200*/
-  }
-
-  if(speed == 38400) {
-    U0BAUD=59;	/*38400*/
-    U0GCR =10; 	/*LSB first and 38400*/
-  }
-
-  if(speed == 9600) {
-    U0BAUD= 59;	/* 9600 */
-    U0GCR = 8; 	/*LSB first and 9600*/
-  }
 
 #ifdef UART0_RTSCTS
   U0UCR = 0x42;		/*defaults: 8N1, RTS/CTS, high stop bit*/