Fix MISRA rule 8.4

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=juno ARCH=aarch32 AARCH32_SP=sp_min RESET_TO_SP_MIN=1 JUNO_AARCH32_EL3_RUNTIME=1 bl32

Change-Id: I3ac25096b55774689112ae37bdf1222f9a9ecffb
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
diff --git a/bl32/sp_min/sp_min_main.c b/bl32/sp_min/sp_min_main.c
index 8e891b7..f06a48b 100644
--- a/bl32/sp_min/sp_min_main.c
+++ b/bl32/sp_min/sp_min_main.c
@@ -20,6 +20,7 @@
 #include <smccc_helpers.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <std_svc.h>
 #include <string.h>
 #include <types.h>
 #include <utils.h>