BCM270X_DT: Don't generate "linux,phandle" props

The EPAPR standard says to use "phandle" properties to store phandles,
rather than the deprecated "linux,phandle" version. By default, dtc
generates both, but adding "-H epapr" causes it to only generate
"phandle"s, saving some space and clutter.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>

arch/arm/boot/dts/Makefile

@@ -813,5 +813,5 @@ clean-files	:= *.dtb
 
 # Enable fixups to support overlays on BCM2708 platforms
 ifeq ($(RPI_DT_OVERLAYS),y)
-	DTC_FLAGS ?= -@
+	DTC_FLAGS ?= -@ -H epapr
 endif

scripts/Makefile.lib

@@ -294,7 +294,7 @@ $(obj)/%.dtb: $(src)/%.dts FORCE
 
 quiet_cmd_dtco = DTCO    $@
 cmd_dtco = $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
-	$(objtree)/scripts/dtc/dtc -@ -O dtb -o $@ -b 0 \
+	$(objtree)/scripts/dtc/dtc -@ -H epapr -O dtb -o $@ -b 0 \
 		-i $(dir $<) $(DTC_FLAGS) \
 		-d $(depfile).dtc.tmp $(dtc-tmp) ; \
 	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)