Revert "pcie: exynos: Skip VREG off on suspend"

This reverts commit 9efc98e7.

Some devices were consistently failing with a pcie link up failure.
These were fixed by keeping the PCIe PHY LDOs on during suspend.
However INT is turned off during suspend and there is no isolation from
INT to PHY, so with PHY on and INT off there is a leakage path that is
out of the design scope. Since there is a possibility of a reliability
issue if a sample has a large leakage, it is prudent to revert this work
around of keeping PHY LDOs on in suspend.

Bug: 212450337
Change-Id: Iedb41cbd37edd897122310fd39c7c3a3f9a4daf6
Signed-off-by: Sajid Dalvi <sdalvi@google.com>