qed: Remove unused qed_ptt_invalidate

qed_ptt_invalidate() was added in 2015 as part of
commit fe56b9e6 ("qed: Add module with basic common support")
but has remained unused.

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://patch.msgid.link/20250414005247.341243-4-linux@treblig.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>