Enable auto-configuration of VUART SIRQ polarity on AST2500.
Signed-off-by: NOskar Senft <osk@google.com>
Link: https://lore.kernel.org/r/20190905144130.220713-3-osk@google.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>