alsa-state: rework bbappend
alsa-state: rework bbappend

to remove the introduction of an extra variable, which
affects task signatures even if it isn't used.

Signed-off-by: Matt Madison <1fa2ef4755a9226cb9a0a4840bd89b158ac71391@madison.systems>

madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra,madisongh/meta-tegra