clang tidy mismatch in J420ToRGB565

Fix parameter names to match definition and other functions
that use dst_rgb565 for the parameter.

BUG=libyuv:819, b:109762970
TESTED=locally built to ensure tests still pass.

Change-Id: I2ac20a999e60cda559a150932f0fc4075224b8a5
Reviewed-on: https://chromium-review.googlesource.com/c/1267795
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Frank Barchard <fbarchard@chromium.org>

include/libyuv/convert_from.h

@@ -246,8 +246,8 @@ int J420ToRGB565(const uint8_t* src_y,
                  int src_stride_u,
                  const uint8_t* src_v,
                  int src_stride_v,
-                 uint8_t* dst_frame,
-                 int dst_stride_frame,
+                 uint8_t* dst_rgb565,
+                 int dst_stride_rgb565,
                  int width,
                  int height);
 
@@ -258,8 +258,8 @@ int H420ToRGB565(const uint8_t* src_y,
                  int src_stride_u,
                  const uint8_t* src_v,
                  int src_stride_v,
-                 uint8_t* dst_frame,
-                 int dst_stride_frame,
+                 uint8_t* dst_rgb565,
+                 int dst_stride_rgb565,
                  int width,
                  int height);