refactor(aarch64): remove weak links to el3_panic

Cleanup weak links to el3_panic and restrict crash_reporting usage
to bl31.

Crash reporting is not used with bl1, bl2 and weak linkage to el3_panic
is used, this can cause ambiguity in understanding the code so remove
this weak linkage and introduce funcs that should be used when we have
crash reporting for el3 panics.

Change-Id: Ic5c711143ba36898ef9574a078b8fa02effceb12
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/bl31/aarch64/crash_reporting.S b/bl31/aarch64/crash_reporting.S
index 6b9767c..4cec110 100644
--- a/bl31/aarch64/crash_reporting.S
+++ b/bl31/aarch64/crash_reporting.S
@@ -15,7 +15,7 @@
 
 	.globl	report_unhandled_exception
 	.globl	report_unhandled_interrupt
-	.globl	el3_panic
+	.globl	report_el3_panic
 	.globl	report_elx_panic
 
 #if CRASH_REPORTING
@@ -297,7 +297,7 @@
 	 * will not return.
 	 * -----------------------------------------------------
 	 */
-func el3_panic
+func report_el3_panic
 	msr	spsel, #MODE_SP_ELX
 	prepare_crash_buf_save_x0_x1
 	adr	x0, panic_msg
@@ -455,7 +455,7 @@
 
 	/* Done reporting */
 	no_ret	plat_panic_handler
-endfunc el3_panic
+endfunc report_el3_panic
 
 #else	/* CRASH_REPORTING */
 func report_unhandled_exception