tree aab8b25f7b61992dc23f3421a1a24b9526f628f1
parent 5c3ae337032d47abcf97ff7b2e10c01480f74a41
author Masahiro Yamada <yamada.masahiro@socionext.com> 1516934521 +0900
committer Masahiro Yamada <yamada.masahiro@socionext.com> 1517485178 +0900

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>