phy: qcom-qmp: qserdes-txrx: Add V6 N4 register offsets

There is a variant of V6 offsets that are different, the QMP PHY N4,
and it is found on the X1E80100 platform.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20231122-phy-qualcomm-v6-v6-20-v7-new-offsets-v3-6-dfd1c375ef61@linaro.org


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