AArch32: Add BL2U support

Add support for firmware upgrade on AArch32.
This patch has been tested on the FVP models.

NOTE: Firmware upgrade on Juno AArch32 is not currently supported.

Change-Id: I1ca8078214eaf86b46463edd14740120af930aec
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>
Co-Authored-By: Yatharth Kochar <yatharth.kochar@arm.com>
diff --git a/plat/arm/common/arm_bl2u_setup.c b/plat/arm/common/arm_bl2u_setup.c
index d09a00d..5dc9eea 100644
--- a/plat/arm/common/arm_bl2u_setup.c
+++ b/plat/arm/common/arm_bl2u_setup.c
@@ -68,7 +68,11 @@
 			      BL_COHERENT_RAM_END
 #endif
 		);
+#ifdef AARCH32
+	enable_mmu_secure(0);
+#else
 	enable_mmu_el1(0);
+#endif
 }
 
 void bl2u_plat_arch_setup(void)