AArch32: Add SP_MIN support for JUNO

This patch adds support for SP_MIN on JUNO platform.
The changes include addition of AArch32 assembly files,
JUNO specific SP_MIN make file and miscellaneous changes
in ARM platform files to enable support for SP_MIN.

Change-Id: Id1303f422fc9b98b9362c757b1a4225a16fffc0b
Signed-off-by: Yatharth Kochar <yatharth.kochar@arm.com>
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>
diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index d68a3e3..5430da0 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -81,7 +81,7 @@
 #else
 
 /*
- * Empty macros for all other BL stages other than BL31
+ * Empty macros for all other BL stages other than BL31 and BL32
  */
 #define ARM_INSTANTIATE_LOCK
 #define arm_lock_init()