rockchip: i2c: use named constant when appropriate

Make it clear that we are using the same value in two adjacent lines.

Signed-off-by: John Keeping <john@metanate.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/i2c/rk_i2c.c b/drivers/i2c/rk_i2c.c
index 63b1418..2597970 100644
--- a/drivers/i2c/rk_i2c.c
+++ b/drivers/i2c/rk_i2c.c
@@ -258,7 +258,7 @@
 
 	while (bytes_remain_len) {
 		if (bytes_remain_len > RK_I2C_FIFO_SIZE)
-			bytes_xferred = 32;
+			bytes_xferred = RK_I2C_FIFO_SIZE;
 		else
 			bytes_xferred = bytes_remain_len;
 		words_xferred = DIV_ROUND_UP(bytes_xferred, 4);