soc/intel/braswell: remove stale spi_loading.c

CONFIG_ALT_CBFS_LOAD_PAYLOAD has long since been removed.
Clean up the remnants in braswell.

Change-Id: I88483a4c3a74ed0c7defacf872b1564c3ce7f909
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/25899
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
2 files changed