media: uvcvideo: Use cached memory for USB transfers

Use kmalloc() + DMA streaming API instead of DMA coherent
memory. The coherent memory is uncached and results in slower
decode performance.

Change-Id: Ibb5990adc3bc319fd704534721140644d76a5787
Signed-off-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>

drivers/media/usb/uvc/uvc_video.c

@@ -26,6 +26,8 @@
 
 #include "uvcvideo.h"
 
+#define CONFIG_DMA_NONCOHERENT 1
+
 /* ------------------------------------------------------------------------
  * UVC Controls
  */