msm:pci: Usage of disable_pc in multiclient scenario

In PCIe driver disable power collapse is
a bool variable, this causes problem in
multi client scenario as there is no vote
aggregation.

This Change is to support enable/disable power collapse
in multi client envirnoment.

Change-Id: Ib126958a18c4be831bf2b993e3a96eaae1a59435
Signed-off-by: Ramya SR <rsr@codeaurora.org>