ANDROID: create build.configs for allmodconfig

Bug: 140224784
Change-Id: I920e8737ee596e1b80428ff9831981c775570070
Signed-off-by: Matthias Maennich <maennich@google.com>
diff --git a/build.config.allmodconfig.x86_64 b/build.config.allmodconfig.x86_64
new file mode 100644
index 0000000..bedb386
--- /dev/null
+++ b/build.config.allmodconfig.x86_64
@@ -0,0 +1,4 @@
+. ${ROOT_DIR}/common/build.config.common
+. ${ROOT_DIR}/common/build.config.x86_64
+. ${ROOT_DIR}/common/build.config.allmodconfig
+