ufs: qcom: set load before setting voltage in regulator

This sequence change is required to avoid dips in voltage
during boot-up.

Apparently, this dip is caused because in the original
sequence, the regulators are initialized in lpm mode.
And then when the load is set to high, and more current
is drawn, than is allowed in lpm, the dip is seen.

CRs-fixed: 2279027
Change-Id: Ie6cbc332cbee8227e16636219e375b18c796a12f
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>