Merge branch 'add-ethernet-dts-schema-for-qcs615-qcs8300'

Yijie Yang says:

====================
Add ethernet dts schema for qcs615/qcs8300

Document the ethernet and SerDes compatible for qcs8300. This platform
shares the same EMAC and SerDes as sa8775p, so the compatible fallback to
it.
Document the ethernet compatible for qcs615. This platform shares the
same EMAC as sm8150, so the compatible fallback to it.
Document the compatible for revision 2 of the qcs8300-ride board.

v2: https://lore.kernel.org/20241017-schema-v2-0-2320f68dc126@quicinc.com
v1: https://lore.kernel.org/132a8e29-3be7-422a-bc83-d6be00fac3e8@kernel.org
====================

Link: https://patch.msgid.link/20241029-schema-v3-0-fbde519eaf00@quicinc.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>