The ks_pcie and pci variables in ks_dw_pcie_msi_irq_mask() and
ks_dw_pcie_msi_irq_unmask() are never used.  Remove them.
Signed-off-by: NShawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>