xlat v2: Fix comment

Change-Id: Id7c22d76b896d1dcac18cdb0e564ce4e02583e33
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

lib/xlat_tables_v2/aarch64/enable_mmu.S

@@ -86,9 +86,10 @@
 	.endm
 
 	/*
-	 * Define MMU-enabling functions for EL1 and EL3:
+	 * Define MMU-enabling functions for EL1, EL2 and EL3:
 	 *
 	 *  enable_mmu_direct_el1
+	 *  enable_mmu_direct_el2
 	 *  enable_mmu_direct_el3
 	 */
 	define_mmu_enable_func 1