Build: change the first parameter of TOOL_ADD_IMG to lowercase

In the next commit, I need the image name in lowercase because
output files are generally named in lowercase.

Unfortunately, TOOL_ADD_IMG takes the first argument in uppercase
since we generally use uppercase Make variables.

make_helpers/build_macros.mk provides 'uppercase' macro to convert
a string into uppercase, but 'lowercase' does not exist.  We can
implement it if we like, but it would be more straightforward to
change the argument of TOOL_ADD_IMG.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/plat/arm/common/arm_common.mk b/plat/arm/common/arm_common.mk
index 33fa574..48e7071 100644
--- a/plat/arm/common/arm_common.mk
+++ b/plat/arm/common/arm_common.mk
@@ -87,10 +87,10 @@
 # Add the build options to pack Trusted OS Extra1 and Trusted OS Extra2 images
 # in the FIP if the platform requires.
 ifneq ($(BL32_EXTRA1),)
-$(eval $(call TOOL_ADD_IMG,BL32_EXTRA1,--tos-fw-extra1))
+$(eval $(call TOOL_ADD_IMG,bl32_extra1,--tos-fw-extra1))
 endif
 ifneq ($(BL32_EXTRA2),)
-$(eval $(call TOOL_ADD_IMG,BL32_EXTRA2,--tos-fw-extra2))
+$(eval $(call TOOL_ADD_IMG,bl32_extra2,--tos-fw-extra2))
 endif
 
 # Enable PSCI_STAT_COUNT/RESIDENCY APIs on ARM platforms
@@ -211,7 +211,7 @@
     BL2_SOURCES		+=	${AUTH_SOURCES}					\
 				plat/common/tbbr/plat_tbbr.c
 
-    $(eval $(call TOOL_ADD_IMG,NS_BL2U,--fwu,FWU_))
+    $(eval $(call TOOL_ADD_IMG,ns_bl2u,--fwu,FWU_))
 
     # We expect to locate the *.mk files under the directories specified below
 ifeq (${ARM_CRYPTOCELL_INTEG},0)