wifi: wlcore: Remove unused wl12xx_cmd_start_fwlog

wl12xx_cmd_start_fwlog() was added in 2011 by
commit 95dac04f ("wl12xx: Support routing FW logs to the host")
but has remained unused.

Remove it.

(I can see the 'stop' is used, and the 'config' is used, so I assume
the 'start' isn't normally needed).

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20250622232638.166283-1-linux@treblig.org


Signed-off-by: Johannes Berg <johannes.berg@intel.com>