Some devices support MSI interrupts. Let's at least try to use them in
platforms that provide MSI capability.

While at that, remove the now duplicated code from qrp_serial_setup().
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Link: https://lore.kernel.org/r/20191001115825.795700-1-felipe.balbi@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>