scripts: turn off some new dtc warnings by default

The latest dtc update adds some new noisy warnings, so turn them off by
default. Disable 'avoid_unnecessary_addr_size' and 'alias_paths'. They
can be re-enabled by building with 'W=1'.
Signed-off-by: NRob Herring <robh@kernel.org>

scripts/Makefile.lib

@@ -277,6 +277,8 @@ DTC ?= $(objtree)/scripts/dtc/dtc
 ifeq ($(findstring 1,$(KBUILD_ENABLE_EXTRA_GCC_CHECKS)),)
 DTC_FLAGS += -Wno-unit_address_vs_reg \
 	-Wno-unit_address_format \
+	-Wno-avoid_unnecessary_addr_size \
+	-Wno-alias_paths \
 	-Wno-pci_device_reg
 endif