ARM: dts: Create the regulator VDD node for PCIE0

We use the gpio90 to control the VDD for PCIE0 but it causes the
wrong pin status. And we can use the regulator-fixed framework to
enable this VDD for PCIE0 and fixed the wrong pin status.

Change-Id: I26b419f95300c2334c3de575939197b47373cd70
Signed-off-by: xiaolin <xiaolin@codeaurora.org>