Revert "input: touchscreen: st: turn off regulator during suspend"

This reverts commit 9517dc4b.
Power team's requirement, to vote this Regulator always, since
keeping this Regulator off causing leakage in another regulator.

CRs-Fixed: 2377331
Change-Id: I25738b5271d03fc89e96d0c4da21de615d036676
Signed-off-by: Vevek Venkatesan <vevekv@codeaurora.org>