Rename mkf2fsuserimg.sh and mksquashfsimage.sh

See other cl in this topic for more information.

Bug: 198619163
Test: Presubmits
Change-Id: Ib39e8513a303a12e8bb6464a114ec39aa087d58a
diff --git a/core/Makefile b/core/Makefile
index 171dbde..7ea85bf 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -4961,9 +4961,9 @@
   mke2fs \
   mke2fs.conf \
   mkfs.erofs \
-  mkf2fsuserimg.sh \
+  mkf2fsuserimg \
   mksquashfs \
-  mksquashfsimage.sh \
+  mksquashfsimage \
   mkuserimg_mke2fs \
   ota_extractor \
   ota_from_target_files \