soc/amd/stoneyridge: remove sb_set_readspeed function

The sb_set_readspeed() was touching the wrong register and
the read speed settings are handled by sb_set_spi100(). Nothing
was using the function, so remove it.

Change-Id: I23b20cf559ee759ba94d49ff6810a9baa64e86fb
Signed-off-by: Marc Jones <marc.jones@scarletltd.com>
Reviewed-on: https://review.coreboot.org/25969
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Martin Roth <martinroth@google.com>
2 files changed