docs: update supported FVP models as per release 11.15.14
docs: update supported FVP models as per release 11.15.14

Change-Id: I65da6ead356e3f4ee47c5a6bf391f65309bafcdd
Signed-off-by: Manish V Badarkhe <d2342ad575f6bc1a5f5a5b89d6db0f72dd7e0e4c@arm.com>

achingupta/arm-trusted-firmware,achingupta/arm-trusted-firmware