libcamera: pipeline: ipa: raspberrypi: Rework drop frame signalling

The IPA now signals up front how many frames it wants the pipeline
handler to drop. This makes it easier to handle up-coming changes to the
buffer handling for import/export buffers.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/libcamera/ipa/raspberrypi.h

@@ -14,6 +14,7 @@ enum RPiConfigParameters {
 	RPI_IPA_CONFIG_LS_TABLE = (1 << 0),
 	RPI_IPA_CONFIG_STAGGERED_WRITE = (1 << 1),
 	RPI_IPA_CONFIG_SENSOR = (1 << 2),
+	RPI_IPA_CONFIG_DROP_FRAMES = (1 << 3),
 };
 
 enum RPiOperations {
@@ -21,7 +22,6 @@ enum RPiOperations {
 	RPI_IPA_ACTION_V4L2_SET_ISP,
 	RPI_IPA_ACTION_STATS_METADATA_COMPLETE,
 	RPI_IPA_ACTION_RUN_ISP,
-	RPI_IPA_ACTION_RUN_ISP_AND_DROP_FRAME,
 	RPI_IPA_ACTION_EMBEDDED_COMPLETE,
 	RPI_IPA_EVENT_SIGNAL_STAT_READY,
 	RPI_IPA_EVENT_SIGNAL_ISP_PREPARE,