drm/amd/display/dc/dce110/dce110_mem_input_v: use swap macro in program_size_and_rotation

Make use of the swap macro instead of _manually_ swapping values
and remove unnecessary variable swap.

This makes the code easier to read and maintain.

This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce110/dce110_mem_input_v.c

@@ -237,26 +237,14 @@ static void program_size_and_rotation(
 	if (rotation == ROTATION_ANGLE_90 ||
 		rotation == ROTATION_ANGLE_270) {
 
-		uint32_t swap;
-		swap = local_size.video.luma_size.x;
-		local_size.video.luma_size.x =
-			local_size.video.luma_size.y;
-		local_size.video.luma_size.y  = swap;
-
-		swap = local_size.video.luma_size.width;
-		local_size.video.luma_size.width =
-			local_size.video.luma_size.height;
-		local_size.video.luma_size.height = swap;
-
-		swap = local_size.video.chroma_size.x;
-		local_size.video.chroma_size.x =
-			local_size.video.chroma_size.y;
-		local_size.video.chroma_size.y  = swap;
-
-		swap = local_size.video.chroma_size.width;
-		local_size.video.chroma_size.width =
-			local_size.video.chroma_size.height;
-		local_size.video.chroma_size.height = swap;
+		swap(local_size.video.luma_size.x,
+		     local_size.video.luma_size.y);
+		swap(local_size.video.luma_size.width,
+		     local_size.video.luma_size.height);
+		swap(local_size.video.chroma_size.x,
+		     local_size.video.chroma_size.y);
+		swap(local_size.video.chroma_size.width,
+		     local_size.video.chroma_size.height);
 	}
 
 	value = 0;