Export erofs blocksize to soong

For soong-only builds.

Bug: 440649477
Test: soong_only_diff_test.py
Change-Id: Ib9d5ea7549efe36e36b467bc5c9304cb8c424fec
diff --git a/core/Makefile b/core/Makefile
index 79fd663..6ed002a 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -4809,10 +4809,10 @@
     --prop com.android.build.init_boot.fingerprint:$(BUILD_FINGERPRINT_FROM_FILE)
 
 BOARD_AVB_VENDOR_BOOT_ADD_HASH_FOOTER_ARGS += \
-    --prop com.android.build.vendor_boot.fingerprint:$(BUILD_FINGERPRINT_FROM_FILE) \
+    --prop com.android.build.vendor_boot.fingerprint:$(BUILD_FINGERPRINT_FROM_FILE)
 
 BOARD_AVB_VENDOR_KERNEL_BOOT_ADD_HASH_FOOTER_ARGS += \
-    --prop com.android.build.vendor_kernel_boot.fingerprint:$(BUILD_FINGERPRINT_FROM_FILE) \
+    --prop com.android.build.vendor_kernel_boot.fingerprint:$(BUILD_FINGERPRINT_FROM_FILE)
 
 BOARD_AVB_RECOVERY_ADD_HASH_FOOTER_ARGS += \
     --prop com.android.build.recovery.fingerprint:$(BUILD_FINGERPRINT_FROM_FILE)