dt-bindings: phy: airoha: Add dtime and Rx AEQ IO registers

Introduce Tx-Rx detection time and Rx AEQ mappings in Airoha EN7581
PCIe-PHY binding. This change is not introducing any backward compatibility
issue since the EN7581 dts is not upstream yet.

Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/a018329ff9678f3360bc6381294f95c62d34f3e3.1719682943.git.lorenzo@kernel.org


Signed-off-by: Vinod Koul <vkoul@kernel.org>