msm: camera: sensor: Add tpg driver support

Add new tpg subdev driver. This change exposes the tpg hw as a new
subdev similar to that of a sensor driver.

CRs-Fixed: 2973850
Change-Id: I6fdb4457d8cc829546896f26bdde8765a4258e7c
Signed-off-by: Tony Lijo Jose <tjose@codeaurora.org>

include/uapi/camera/media/cam_req_mgr.h

@@ -33,6 +33,7 @@
 #define CAM_OPE_DEVICE_TYPE       (CAM_DEVICE_TYPE_BASE + 15)
 #define CAM_TFE_DEVICE_TYPE       (CAM_DEVICE_TYPE_BASE + 16)
 #define CAM_CRE_DEVICE_TYPE       (CAM_DEVICE_TYPE_BASE + 17)
+#define CAM_TPG_DEVICE_TYPE       (CAM_DEVICE_TYPE_BASE + 18)
 
 /* cam_req_mgr hdl info */
 #define CAM_REQ_MGR_HDL_IDX_POS           8