Update README for video driver split from main OVMF firmware.
Add note to set TARGET_ARCH.
Add link to https://edk2.tianocore.org/build-ovmf.html.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8945 6f19259b-4bc3-4df7-8a09-765794883524
1 file changed