net: phy: tja11xx: add interface mode and RMII REF_CLK support

Add below features support for both TJA1100 and TJA1101 cards:
- Add MII and RMII mode support.
- Add REF_CLK input/output support for RMII mode.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>