ARM: dts: msm: update UFS regulator for SA8155 V2

The VDDA_UFS_2LN_CORE supply has been changed from L18C on SA8155 V1
to L5A on SA8155 V2. Override this UFS regulator with the new mapping.

Change-Id: I5353111448d70a5a574f72cca16a490a93c78809
Signed-off-by: Bharathraj Nagaraju <snbraj@codeaurora.org>