lib: utils: Move fdt fixup helper routines to a different file

FDT helper file contain both fdt fixup and parsing functions.

Split the fixup related functions to a separate file for a better code
organization.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>

lib/utils/fdt/objects.mk

@@ -5,3 +5,4 @@
 #
 
 libsbiutils-objs-y += fdt/fdt_helper.o
+libsbiutils-objs-y += fdt/fdt_fixup.o