PCI: keystone: Remove unused argument from ks_dw_pcie_host_init()

No functional change. Remove unused "msi_intc_np" argument from
ks_dw_pcie_host_init().

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>