Revert "Build GSIs (aosp_$arch products) in sparse format"

This reverts commit bc0248f211fb14bef6158c9aee29fe820fb061c7.

Reason for revert: Triggered preexisting issue with e2fsck and ASAN

Bug: 112062612
Change-Id: I7b52fe539252ab1bb7229d32accb7abd6417f470
diff --git a/target/board/BoardConfigGsiCommon.mk b/target/board/BoardConfigGsiCommon.mk
index 4a60d47..24614de 100644
--- a/target/board/BoardConfigGsiCommon.mk
+++ b/target/board/BoardConfigGsiCommon.mk
@@ -3,12 +3,11 @@
 # Common compile-time definitions for GSI
 #
 
-# GSIs always use ext4.
+# system.img is always ext4 with sparse option
 TARGET_USERIMAGES_USE_EXT4 := true
-# GSIs are historically released in sparse format.
-# Some vendors' bootloaders don't work properly with raw format images. So
-# we explicit specify this need below (even though it's the current default).
-TARGET_USERIMAGES_SPARSE_EXT_DISABLED := false
+# TODO(b/63790380): emulator doesn't support sparse yet
+#TARGET_USERIMAGES_SPARSE_EXT_DISABLED := false
+TARGET_USERIMAGES_SPARSE_EXT_DISABLED := true
 TARGET_USES_MKE2FS := true
 
 # Android Verified Boot (AVB):