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

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: I40498687daa53ba8186020b97de4f2ad1d92717d
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>