Now that all platforms are updated to provide spi bus map, there is no
need to keep the spi_setup_slave as a weak symbol.
BUG=b:38430839
Change-Id: I59b9bbb5303dad7ce062958a0ab8dee49a4ec1e0
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: https://review.coreboot.org/19781
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>