spmi: spmi-pmic-arb: enable the SPMI interrupt as a wakeup source

Currently the SPMI interrupt will not wake the device. Enable this
interrupt as a wakeup source.

CRs-Fixed: 1030478
Change-Id: Ic780118b7b38a0679f5d5037e404069aa1f2be0a
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>
diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index e5c6ca9..79dda04 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -1135,6 +1135,7 @@
 	}
 
 	irq_set_chained_handler_and_data(pa->irq, pmic_arb_chained_irq, pa);
+	enable_irq_wake(pa->irq);
 
 	err = spmi_controller_add(ctrl);
 	if (err)