media: ov5640: adjust xclk_max

According to ov5640 datasheet xvclk is allowed to be between 6 and 54 MHz.
I run a successful test with 27 MHz.

Signed-off-by: Philipp Puschmann <pp@emlix.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/ov5640.c

@@ -30,7 +30,7 @@
 
 /* min/typical/max system clock (xclk) frequencies */
 #define OV5640_XCLK_MIN  6000000
-#define OV5640_XCLK_MAX 24000000
+#define OV5640_XCLK_MAX 54000000
 
 #define OV5640_DEFAULT_SLAVE_ID 0x3c