alsa-tools: fix the AUTOMAKE_DIR

alsa-tools: fix the AUTOMAKE_DIR

There should be only one automake under the STAGING_DATADIR_NATIVE in
theory, but der_steffi@gmx.de has reported an odd problem which seemed
like that there are more than one. However, the "automake
--print-libdir" is the regular way to locate automake libdir.

[YOCTO #5706]

Reported-by: der_steffi@gmx.de
(From OE-Core rev: 59f46f9c9f8a36d8829b9b33291249a7b92ebcac)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>