pinctrl: msm: set irq's flow type with controller extension always

Kill improper if statement so that irq controller extension can configure
flow type always including when it's dual edge type.

CRs-fixed: 685146
Change-Id: Ic8aa9e52a217bf12d381aa68464f4d3cbc82d74e
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>