Revert "Require clang be used to assemble the kernel"

This reverts commit 8631131e28ae13afd4db9a083398ec445b40af4e.

Reason for revert: DroidMonitor-triggered revert due to breakage https://android-build.googleplex.com/builds/quarterdeck?branch=git_master&target=tangor-userdebug&lkgb=8077945&lkbb=8078056&fkbb=8078056, bug b/214440119

Bug: 214440119
Change-Id: Ib0b4c1d51333bba7ab989efd911c0783febb78d6
diff --git a/android-5.10/android-base.config b/android-5.10/android-base.config
index 42eb70f..3e4bf29 100644
--- a/android-5.10/android-base.config
+++ b/android-5.10/android-base.config
@@ -20,7 +20,6 @@
 CONFIG_ANDROID_BINDER_IPC=y
 CONFIG_ANDROID_BINDERFS=y
 CONFIG_ASHMEM=y
-CONFIG_AS_IS_LLVM=y
 CONFIG_AUDIT=y
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_SCRIPT=y
diff --git a/android-5.15/android-base.config b/android-5.15/android-base.config
index 42eb70f..3e4bf29 100644
--- a/android-5.15/android-base.config
+++ b/android-5.15/android-base.config
@@ -20,7 +20,6 @@
 CONFIG_ANDROID_BINDER_IPC=y
 CONFIG_ANDROID_BINDERFS=y
 CONFIG_ASHMEM=y
-CONFIG_AS_IS_LLVM=y
 CONFIG_AUDIT=y
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_SCRIPT=y