context_mgmt: Fix MISRA defects

The macro EL_IMPLEMENTED() has been deprecated in favour of the new
function el_implemented().

Change-Id: Ic9b1b81480b5e019b50a050e8c1a199991bf0ca9
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/bl31/bl31_main.c b/bl31/bl31_main.c
index 62bea01..77b59ed 100644
--- a/bl31/bl31_main.c
+++ b/bl31/bl31_main.c
@@ -159,9 +159,9 @@
 	 * Ensure that the build flag to save AArch32 system registers in CPU
 	 * context is not set for AArch64-only platforms.
 	 */
-	if (EL_IMPLEMENTED(1) == EL_IMPL_A64ONLY) {
+	if (el_implemented(1) == EL_IMPL_A64ONLY) {
 		ERROR("EL1 supports AArch64-only. Please set build flag "
-				"CTX_INCLUDE_AARCH32_REGS = 0");
+				"CTX_INCLUDE_AARCH32_REGS = 0\n");
 		panic();
 	}
 #endif