ANDROID: Enable hermetic toolchain

Enable the use of the hermetic toolchain across all builds of this
branch. For allmodconfig builds, also allow the use of openssl from the
host.

Bug: 157507870
Change-Id: Iabb1fe4f760f9821df0318934942302ffffade7c
Signed-off-by: Matthias Maennich <maennich@google.com>

build.config.allmodconfig

@@ -10,3 +10,5 @@ function update_config() {
     (cd ${OUT_DIR} && \
      make O=${OUT_DIR} $archsubarch CLANG_TRIPLE=${CLANG_TRIPLE} CROSS_COMPILE=${CROSS_COMPILE} "${TOOL_ARGS[@]}" ${MAKE_ARGS} olddefconfig)
 }
+
+ADDITIONAL_HOST_TOOLS="${ADDITIONAL_HOST_TOOLS} openssl"

build.config.common

@@ -11,3 +11,5 @@ EXTRA_CMDS=''
 STOP_SHIP_TRACEPRINTK=1
 IN_KERNEL_MODULES=1
 DO_NOT_STRIP_MODULES=1
+
+HERMETIC_TOOLCHAIN=1