fix(cc-713): fix a build failure with CC-713 library

Fixed a below build failure with CC-713 library
error:
implicit declaration of function ‘mbedtls_x509_get_rsassa_pss_params’
[-Werror=implicit-function-declaration]

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: If298ec16d133cf54413c299327b2c007ec4117b2
diff --git a/drivers/auth/cryptocell/713/cryptocell_crypto.c b/drivers/auth/cryptocell/713/cryptocell_crypto.c
index 5f390a2..077317e 100644
--- a/drivers/auth/cryptocell/713/cryptocell_crypto.c
+++ b/drivers/auth/cryptocell/713/cryptocell_crypto.c
@@ -13,6 +13,7 @@
 #include <drivers/auth/crypto_mod.h>
 
 #include <mbedtls/oid.h>
+#include <mbedtls/x509.h>
 
 #define LIB_NAME		"CryptoCell 713 SBROM"
 #define RSA_SALT_LEN		32