Revert "Revert "vendor/mahdi: Add chromium_prebuilt.sh""

This reverts commit 8a028511603a1bde75397838bfe72c052f7c4e6e.
Fix prebuilt chromium

10x Jose for the idea

Change-Id: I856eb592cff86158c93505bedb55b5c4518da25c

Conflicts:
	config/common.mk