[media] coda: add missing header dependencies

We get 1 warning when building kernel with W=1:
drivers/media/platform/coda/coda-h264.c:22:5: warning: no previous prototype for 'coda_h264_padding' [-Wmissing-prototypes]

In fact, this function is declared in coda.h, so this patch
add missing header dependencies.

Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/media/platform/coda/coda-h264.c

@@ -13,6 +13,7 @@
 
 #include <linux/kernel.h>
 #include <linux/string.h>
+#include <coda.h>
 
 static const u8 coda_filler_nal[14] = { 0x00, 0x00, 0x00, 0x01, 0x0c, 0xff,
 			0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80 };