net: stmmac: dwmac4: Fix MTL_OP_MODE_RTC mask and shift macros

RTC fields are located in bits [1:0]. Correct the _MASK and _SHIFT
macros to use the appropriate mask and shift.

Signed-off-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241107063637.2122726-2-leyfoon.tan@starfivetech.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>