arm64: dts: qcom: sa8775p: add a node for the second serdes PHY

Add a node for the SerDes PHY used by EMAC1 on sa8775p-ride.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Andrew Halaney <ahalaney@redhat.com>
Link: https://lore.kernel.org/r/20230810080909.6259-2-brgl@bgdev.pl


Signed-off-by: Bjorn Andersson <andersson@kernel.org>