ARM: dts: msm: keep UFS phy regulator always on

We may see some glitch on UFS host TX when turning on/off the UFS PHY
regulator, this change keeps this regulator always ON but still tries
to keep the regulator in LPM mode.

Change-Id: I1e9bfddf815cda014ea2d872bfa79b7381e6be94
Signed-off-by: Nitin Rawat <nitirawa@codeaurora.org>