net: ksz9477: add support for KSZ9893 GbE switch

Copy and tweak the required code from the linux kernel.
Only the KSZ9893 has been tested.

Signed-off-by: Karsten Wiese <karsten.wiese@protechna.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
1 file changed