[PATCH v14 28/38] phy: core: add notifier infrastructure

[Igor Paunovic]

Tested on Orange Pi 5 Plus (RK3588), 7.2.0-rc7 from rockchip-devel at
ea51774c5c42; details in my reply to the cover letter.

Tested-by: Igor Paunovic <royalnet026 at gmail.com> # Orange Pi 5 Plus