don't call blobutil directly from lbmk

it's bloat, and was only there for backwards compatibility
with the old commands, but the new commands are e.g.

./update blobs inject

instead of:

./blobutil inject

this results in a slight code size reduction in lbmk

Signed-off-by: Leah Rowe <leah@libreboot.org>

resources/scripts/update/blobs/extract

@@ -142,8 +142,8 @@ fail()
 
 print_help()
 {
-	printf "Usage: ./blobutil extract {boardname} {path/to/vendor_rom}\n"
-	printf "Example: ./blobutil extract x230 12mb_flash.bin\n"
+	printf "Usage: ./update blobs extract {boardname} {path/to/vendor_rom}\n"
+	printf "Example: ./update blobs extract x230 12mb_flash.bin\n"
 	printf "\nYou need to specify exactly 2 arguments\n"
 }