i350_evk/i350_pumpkin/i350_sb35/i500_pumpkin: update fip binary name

The fip binary name has now the following format fip-*.

Delete the i350_* fip binaries with the old format. Rename the i500_pumpkin fip binaries to the new format.

Signed-off-by: Vitor Sato Eschholz vsatoes@baylibre.com