Storage: refactor sg_utils build rule

Bug: 264001741
Test: build
Change-Id: I9c575d8c5d12837cf14d76cf70c384a474502434
Signed-off-by: Randall Huang <huangrandall@google.com>
diff --git a/storage/storage.mk b/storage/storage.mk
index 5542ac8..cd0556d 100644
--- a/storage/storage.mk
+++ b/storage/storage.mk
@@ -1,3 +1,8 @@
 BOARD_VENDOR_SEPOLICY_DIRS += device/google/gs-common/storage/sepolicy
 
 PRODUCT_PACKAGES += dump_storage.sh
+
+# Pixel storage tool
+PRODUCT_PACKAGES_DEBUG += \
+	sg_write_buffer \
+	sg_read_buffer