generic: 5.15: replace ramips AR8033 fiber patch with 5.18 patches

generic: 5.15: replace ramips AR8033 fiber patch with 5.18 patches

A patch was added in kernel 5.4 to support the fiber operation of
AR8033 with ramips devices. In kernel 5.18 similar enhancements
were added to the kernel. Those patches are required for other
fiber based devices but when added, build fails for ramips targets.
This commit removes the ramips patch and adds the kernel 5.18 ones.

Signed-off-by: Daniel Kestrel <kestrel1974@t-online.de>
[ split commit,refresh patch and improve commit message ]
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>