hwrng: cctrng - add missing include to linux/fips.h

This fixes build failure when CONFIG_CRYPTO_FIPS is defined.

Fixes: a583ed31 ("hwrng: cctrng - introduce Arm CryptoCell driver")
Signed-off-by: Hadar Gat <hadar.gat@arm.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kbuild test robot <lkp@intel.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/char/hw_random/cctrng.c

@@ -15,6 +15,7 @@
 #include <linux/completion.h>
 #include <linux/of.h>
 #include <linux/bitfield.h>
+#include <linux/fips.h>
 
 #include "cctrng.h"