i2c: at91_i2c: Fix the wrong include file

Since the 'clk_client.h' doesn't exist, it should be 'clk.h'.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/i2c/at91_i2c.c

@@ -8,7 +8,7 @@
 
 #include <asm/io.h>
 #include <common.h>
-#include <clk_client.h>
+#include <clk.h>
 #include <dm.h>
 #include <errno.h>
 #include <fdtdec.h>