RT3070 driver update

1) remove mainline (net/wireless/usb versions) from config since they don't do anything but associate
2) port drivers/staging/ ralink drivers from Linus' tree to here
   includes update to hexdump.c and kernel.h for hex_to_bin (replaces nibble, ABI change)
   includes update to ralink driver source to modify usb_alloc/free_coherent to old usb_buffer_alloc/free
   add it to the defconfig

You will need to grab the "Firmware RT28XX/RT30XX USB series" firmware (v 22 or above) from

http://www.ralink.com.tw/support.php?s=2

Unzip the zip file, inside is a license and rt2870.bin (an 8192 byte file). Copy this to
/lib/firmware/rt3070.bin (note the name change!) and the driver should load and work. Tested
with multiple pings, traceroutes, file copies (SCP and CIFS), YouTube..

include/linux/kernel.h

@@ -359,6 +359,8 @@ static inline char *pack_hex_byte(char *buf, u8 byte)
 	return buf;
 }
 
+extern int hex_to_bin(char ch);
+
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt
 #endif