ANDROID: Use DTC from the hermetic toolchain

Set DTC from kernel build tools. The DTC is the same as used in AOSP.

Bug: 162811113
Change-Id: I16c513ba9c6ce5a1206e95e8de4ae923c11db894
Signed-off-by: Elliot Berman <[email protected]>

Author: eberman-quic

build.config.common

@@ -7,6 +7,7 @@ LD=ld.lld
 NM=llvm-nm
 OBJCOPY=llvm-objcopy
 DEPMOD=depmod
+DTC=dtc
 CLANG_PREBUILT_BIN=prebuilts-master/clang/host/linux-x86/clang-r383902/bin
 BUILDTOOLS_PREBUILT_BIN=build/build-tools/path/linux-x86