drivers: mdio: add adin2111

Adds MDIO driver. Works via exposed
ADIN2111 functions.

It is possible to access Clause 45 and 22 registers.

Due to MDIO API limitation Clause 45 access
is done using driver specific MDIO functions.

Provides API and functions for PHY driver.

Signed-off-by: Georgij Cernysiov <geo.cgv@gmail.com>
7 files changed