phy: qcom-ufs: Modify the vdd-phy min-max range

There are 2 issues with setting the vdd-phy voltage:
1. The min & max range that's defined is 1v, whereas
   0.925 (+/- 5%) is the required voltage. A range of
   0.8v to 0.925v would suffice.
2. This defined range is over-ridden with the current
   rail-voltage. This assumes that some consumer has
   set the regulator to the correct voltage.

This change corrects the defined min/max range to
0.8v-0.925v for vdd-phy.
It also removes the code that's causing [2].

CRs-fixed: 1095116
Change-Id: I943bc4f38385036b21c1f9a2e479d6e94ac12813
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
[cang@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Can Guo <cang@codeaurora.org>