fix(misra): fix MISRA defects

This patch resolves the MISRA issues reported in mailing list.
It addresses the following MISRA Rules violations - Rule 15.7 and
Rule 2.4.

* As per Rule 15.7, All if.. else if constructs should be terminated
with an else statement and hence the conditional block
has been changed to switch..case. Updated get_el_str() to include
all EL cases.

* As per Rule 2.4, A project should not contain unused tag declarations,
hence intr_type_desc tag is removed.

* bl31_lib_init is only used in translation unit and hence it's
declaration is removed from bl31.h and the definition is made static to
maintain visibility.

Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: Ica1d3041566baf51befcad5fd3714189117ba193

bl31/bl31_main.c

@@ -83,7 +83,7 @@ uintptr_t get_arm_std_svc_args(unsigned int svc_mask)
 /*******************************************************************************
  * Simple function to initialise all BL31 helper libraries.
  ******************************************************************************/
-void __init bl31_lib_init(void)
+static void __init bl31_lib_init(void)
 {
 	cm_init();
 }

bl31/interrupt_mgmt.c

@@ -34,7 +34,7 @@
  *
  *           All other bits are reserved and SBZ.
  ******************************************************************************/
-typedef struct intr_type_desc {
+typedef struct {
 	interrupt_type_handler_t handler;
 	u_register_t scr_el3[2];
 	uint32_t flags;

include/bl31/bl31.h

@@ -22,6 +22,5 @@ void bl31_register_bl32_init(int32_t (*func)(void));
 void bl31_register_rmm_init(int32_t (*func)(void));
 void bl31_warm_entrypoint(void);
 void bl31_main(void);
-void bl31_lib_init(void);
 
 #endif /* BL31_H */

plat/common/aarch64/plat_common.c

@@ -72,12 +72,19 @@ int plat_sdei_validate_entry_point(uintptr_t ep, unsigned int client_mode)
 
 const char *get_el_str(unsigned int el)
 {
-	if (el == MODE_EL3) {
+	switch (el) {
+	case MODE_EL3:
 		return "EL3";
-	} else if (el == MODE_EL2) {
+	case MODE_EL2:
 		return "EL2";
-	}
+	case MODE_EL1:
 		return "EL1";
+	case MODE_EL0:
+		return "EL0";
+	default:
+		assert(false);
+		return NULL;
+	}
 }
 
 #if FFH_SUPPORT