Move device-specific vars from mainline common

Move a couple of variables out of BoardConfigMainlineCommon
because they vary either by device or by how they build in
AOSP vs internal.

Bug: 80410283
Test: presubmit
Change-Id: Ia42df91ad8c8d8fc4618be375a17ea23896f4352
diff --git a/target/board/BoardConfigGsiCommon.mk b/target/board/BoardConfigGsiCommon.mk
index d53995c..eee65f4 100644
--- a/target/board/BoardConfigGsiCommon.mk
+++ b/target/board/BoardConfigGsiCommon.mk
@@ -6,6 +6,8 @@
 
 include build/make/target/board/BoardConfigMainlineCommon.mk
 
+TARGET_NO_KERNEL := true
+
 # This flag is set by mainline but isn't desired for GSI.
 BOARD_USES_SYSTEM_OTHER_ODEX :=