Stop building boot-(debug|with-debug-ramdisk)-*.img for GSI/GKI

We don't need these anymore as we now export userdebug_plat_sepolicy.cil
to artifacts dist dir directly, so repack_bootimg don't need to use
boot-(debug|with-debug-ramdisk)-*.img as repack source anymore.

Bug: 202129499
Test: Check presubmit artifacts don't have boot-*debug*.img
Change-Id: I3161e42b00a93177a1a4cb3b22da2218d294b7a7
diff --git a/target/product/gsi_release.mk b/target/product/gsi_release.mk
index d0a98c0..9237cb7 100644
--- a/target/product/gsi_release.mk
+++ b/target/product/gsi_release.mk
@@ -67,6 +67,8 @@
 
 # Do not build non-GSI partition images.
 PRODUCT_BUILD_CACHE_IMAGE := false
+PRODUCT_BUILD_DEBUG_BOOT_IMAGE := false
+PRODUCT_BUILD_DEBUG_VENDOR_BOOT_IMAGE := false
 PRODUCT_BUILD_USERDATA_IMAGE := false
 PRODUCT_BUILD_VENDOR_IMAGE := false
 PRODUCT_BUILD_SUPER_PARTITION := false