airoha: drop duplicate patch replaced by backport version

Drop duplicated patch that weren't dropped by the backport commit.

Affected patch:

- 910-01-v7.0 (duplicate of 121-v7.0)
- 910-02-v7.0 (duplicate of 123-v7.0)

Signed-off-by: YaleiZang <yalei.zang@airoha.com>
(improve commit description and title)
Link: openwrt/openwrt#23046
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

Author: YaleiZang