sharpyuv: add support for 10/12/16 bit rgb and 10/12 bit yuv.

10bit+ input is truncated to 10bits for now.

Change-Id: I7ac00ca54c623d94c76ccd8954418e11095997d2

sharpyuv/sharpyuv_csp.h

@@ -30,7 +30,7 @@ typedef struct {
   // Y = Kr * r + Kg * g + Kb * b where Kg = 1 - Kr - Kb.
   float kr;
   float kb;
-  int bits;  // Only 8 bit is supported by SharpYuvConvert.
+  int bit_depth;  // 8, 10 or 12
   SharpYuvRange range;
 } SharpYuvColorSpace;