ARM: dts: msm: Have PCIe RC control NTN3 and its ETH power for sdxlemur

When connecting a NTN3 switch to sdxlemur, host needs to control
the power to the switch as well as to the ETHs downstream. Add DT
entry in PCIe root complex node to toggle the regulators that
controls power to NTN3 and its ETHs on sdxlemur.

Change-Id: I747b3ba718ad9c4aaed1b7b0ac7aa79edf36fc7f