msm: pcie: remove PCI_MSM_MSI dependencies

PCI_MSM_MSI is no longer its own config option. It is bounded
with PCI_MSM so remove any dependencies for it.

Change-Id: Ic417b5e063c268f1bda73e28ffe790c4da4698e8
Signed-off-by: Tony Truong <truong@codeaurora.org>