OMAP2+: voltage: move prm_irqst_reg from VP into voltage domain

The prm_irqst_reg is not part of the VP.  Move it up into the common
voltage domain struct.

Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/mach-omap2/vp3xxx_data.c

@@ -51,7 +51,6 @@ static const struct omap_vp_common_data omap3_vp_common = {
 };
 
 static const struct omap_vp_prm_irqst_data omap3_vp1_prm_irqst_data = {
-	.prm_irqst_reg = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
 	.tranxdone_status = OMAP3430_VP1_TRANXDONE_ST_MASK,
 };
 
@@ -67,7 +66,6 @@ struct omap_vp_instance_data omap3_vp1_data = {
 };
 
 static const struct omap_vp_prm_irqst_data omap3_vp2_prm_irqst_data = {
-	.prm_irqst_reg = OMAP3_PRM_IRQSTATUS_MPU_OFFSET,
 	.tranxdone_status = OMAP3430_VP2_TRANXDONE_ST_MASK,
 };