qcom: devicetree: Enable building qcom dtbo

Change-Id: I7b1f13ce7189f5b784564f6670fcdbc6dc9c9550

Makefile

@@ -3,7 +3,7 @@ vendor := $(srctree)/$(src)
 
 ifneq "$(wildcard $(vendor)/qcom)" ""
 #OPLUS_DTS_OVERLAY start
-	#subdir-y += qcom
+	subdir-y += qcom
 #OPLUS_DTS_OVERLAY end
 endif
 #OPLUS_DTS_OVERLAY start

qcom/Makefile

@@ -6,6 +6,8 @@
 # Combined dtb target is also generated using the fdt_overlay tool.
 # dtb-y += <base>-<board>.dtb
 
+ifneq (,)
+
 add-overlays = $(foreach o,$1,$(foreach b,$2,$(eval $(basename $b)-$(basename $o)-dtbs = $b $o) $(basename $b)-$(basename $o).dtb))
 
 # sun-dtb-y is list of DTBs to install when doing non-overlay build
@@ -369,6 +371,8 @@ dtb-y += $(parrot_tuivm-dtb-y)
 endif
 endif
 
+endif
+
 always-y        := $(dtb-y)
 subdir-y        := $(dts-dirs)
 subdir-y        += audio bt camera data display dsp eSE eva fingerprint graphics mm mmrm nfc synx video wlan