Fix MISRA rule 8.4 Part 4

Rule 8.4: A compatible declaration shall be visible when
          an object or function with external linkage is defined

Fixed for:
	make DEBUG=1 PLAT=fvp SPD=tspd TRUSTED_BOARD_BOOT=1 \
	     GENERATE_COT=1 ARM_ROTPK_LOCATION=devel_rsa \
	     ROT_KEY=arm_rotprivk_rsa.pem MBEDTLS_DIR=mbedtls all

Change-Id: Ie4cd6011b3e4fdcdd94ccb97a7e941f3b5b7aeb8
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
diff --git a/include/drivers/auth/auth_mod.h b/include/drivers/auth/auth_mod.h
index 74fc15f..bb3b8f9 100644
--- a/include/drivers/auth/auth_mod.h
+++ b/include/drivers/auth/auth_mod.h
@@ -44,6 +44,9 @@
 			(const auth_img_desc_t *const)&_cot[0]; \
 	unsigned int auth_img_flags[MAX_NUMBER_IDS]
 
+extern const auth_img_desc_t *const cot_desc_ptr;
+extern unsigned int auth_img_flags[MAX_NUMBER_IDS];
+
 #endif /* TRUSTED_BOARD_BOOT */
 
 #endif /* __AUTH_MOD_H__ */