msm: ep_pcie: Do not configure MHI mmio if bios-locking is enabled

Avoid (re)configuring MHI mmio registers to initial state during
pcie core init in host reboot scenario as they would have been
already restored by the MHI driver.

Change-Id: I7cb7c03191ed25888f23cdbff71b53d63c3da633
Signed-off-by: Siva Kumar Akkireddi <sivaa@codeaurora.org>