fsp_baytrail: Fix CONFIG_ENABLE_FSP_FAST_BOOT

While pushing the fsp_baytrail code, it was requested that we change
CONFIG_ENABLE_FAST_BOOT to CONFIG_ENABLE_FSP_FAST_BOOT.

These were missed in the change.

Change-Id: If8af3f90b0f5cc9154ff1d3a387f442430f42dee
Signed-off-by: Martin Roth <martin.roth@se-eng.com>
Reviewed-on: http://review.coreboot.org/5972
Tested-by: build bot (Jenkins)
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>