Add support for CONFIG_EFI_PARTITION (GUID Partition Table)

The GUID (Globally Unique Identifier) Partition Table (GPT) is a part
of EFI. See http://en.wikipedia.org/wiki/GUID_Partition_Table

Based on linux/fs/partitions/efi.[ch]

Signed-off-by: Richard Retanubun <RichardRetanubun@RugggedCom.com>

disk/Makefile

@@ -32,6 +32,7 @@ COBJS-y += part_mac.o
 COBJS-y += part_dos.o
 COBJS-y += part_iso.o
 COBJS-y += part_amiga.o
+COBJS-y += part_efi.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)