ARM: dts: msm: Update LDO for PCIe RC on SDX20

PCIe uses L1 LDO for SDX20. Update LDO number and voltage levels
that are needed for LDO accordingly for PCIe RC mode.

Change-Id: If7e8483a5e421ba32713d11d0b56d792258c3668
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>