msm: pcie: release PCIe regulator current load vote when powering off

When turning off the link, PCIe releases its regulator enable
vote. However, PCIe regulator current load vote is still
effective and will cause a power leakage if another client has
that regulator enabled. Release requested current load when
turning off the link to prevent leakage.

Change-Id: I9514eb9a8ab11567e9ccca2b6fcb47fe6404bf1b
Signed-off-by: Tony Truong <truong@codeaurora.org>