spmi: pmic-arb: support updating interrupt type flags

Have the qpnpint_irq_set_type function clear unwanted high/low
trigger bits when updating the interrupt flags.

Change-Id: Ie55d6178ea94350ecf8c79714cb863ea63d76ea6
Signed-off-by: Yimin Peng <yiminp@codeaurora.org>
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>