Add kernel 2.6.30 support

The device is booting and Ethernet is working, but nothing more was tested.

SVN-Revision: 18589

target/linux/amazon/patches-2.6.30/210-remove_unnedded_variables.patch

@@ -0,0 +1,12 @@
+--- a/arch/mips/amazon/prom.c
++++ b/arch/mips/amazon/prom.c
+@@ -59,9 +59,6 @@ void prom_printf(const char * fmt, ...)
+ 
+ void __init prom_init(void)
+ {
+-	mips_machgroup = MACH_GROUP_INFINEON;
+-	mips_machtype = MACH_INFINEON_AMAZON;
+-
+ 	strcpy(&(arcs_cmdline[0]), "console=ttyS0,115200 rootfstype=squashfs,jffs2");
+ 	
+ 	add_memory_region(0x00000000, 0x1000000, BOOT_MEM_RAM);