alsa-plugins: fix libavtp vs. avtp packageconfig

Fix PACKAGECONFIG to refer to libavtp instead of avtp as this is what
the project and everything is really called everywhere.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/alsa/alsa-plugins_1.2.6.bb

@@ -34,7 +34,7 @@ PACKAGECONFIG ??= "\
         speexdsp \
         ${@bb.utils.filter('DISTRO_FEATURES', 'pulseaudio', d)} \
 "
-PACKAGECONFIG[aaf] = "--enable-aaf,--disable-aaf,avtp"
+PACKAGECONFIG[aaf] = "--enable-aaf,--disable-aaf,libavtp"
 PACKAGECONFIG[jack] = "--enable-jack,--disable-jack,jack"
 PACKAGECONFIG[libav] = "--enable-libav,--disable-libav,libav"
 PACKAGECONFIG[maemo-plugin] = "--enable-maemo-plugin,--disable-maemo-plugin"