flashchips: Fix 4BA advertisement for dummy chip

The dummyflasher only supports the native 4BA read and write
commands, so only advertise these.

Change-Id: Ia7340835ce1680d197f250bdb5990ab2ffe3671f
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/54068
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
1 file changed