soc/amd/picasso: Drop mainboard_romstage_entry_s3
mainboard_romstage_entry_s3() was dropped from zork (CB:43476). This
function call in picasso does not do anything and hence is being dropped.
BUG=b:
154351731
Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I10e15422d7eef5af9c19737c32e433718b6479d6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43477
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>