drm/amd/display: fix pflip irq registor for raven

The pflip registor index was incorrect, this was overriding the macro
and caused a dummy irq call.
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/irq/dcn10/irq_service_dcn10.c

@@ -272,8 +272,8 @@ irq_source_info_dcn10[DAL_IRQ_SOURCES_NUMBER] = {
 	pflip_int_entry(1),
 	pflip_int_entry(2),
 	pflip_int_entry(3),
-	[DC_IRQ_SOURCE_PFLIP4] = dummy_irq_entry(),
 	[DC_IRQ_SOURCE_PFLIP5] = dummy_irq_entry(),
+	[DC_IRQ_SOURCE_PFLIP6] = dummy_irq_entry(),
 	[DC_IRQ_SOURCE_PFLIP_UNDERLAY0] = dummy_irq_entry(),
 	gpio_pad_int_entry(0),
 	gpio_pad_int_entry(1),