arm64: dts: qcom: ipq9574-rdp433: Reorganize DTS to introduce eMMC support

arm64: dts: qcom: ipq9574-rdp433: Reorganize DTS to introduce eMMC support

The RDP433 has NAND and eMMC variants. Presently, only NAND variant is
supported. To enable support for eMMC variant, move the common nodes from
ipq9574-rdp433.dts to ipq9574-rdp433-common.dtsi. ipq9574-rdp433-common.dtsi
will be included in rdp433 NAND and eMMC DT files.

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260205085936.3220108-3-varadarajan.narayanan@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>