MIPS: add initial infrastructure for device-tree files

Prepare sub-folder for device-tree files. Make support for
device-tree on MIPS available in Kbuild/Kconfig.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>
diff --git a/arch/mips/config.mk b/arch/mips/config.mk
index 415ec8a..b78d495 100644
--- a/arch/mips/config.mk
+++ b/arch/mips/config.mk
@@ -72,6 +72,7 @@
 PF_PIC				:= -fpic
 PF_PIE				:= -pie
 PF_OBJCOPY			:= -j .got -j .u_boot_list -j .rel.dyn -j .padding
+PF_OBJCOPY			+= -j .dtb.init.rodata
 endif
 
 PLATFORM_CPPFLAGS		+= -G 0 $(PF_ABICALLS) $(PF_PIC)