Add generic Kbuild files for 'make headers_install'

This adds the Kbuild files listing the files which are to be installed by
the 'headers_install' make target, in generic directories.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>

include/sound/Kbuild

@@ -0,0 +1,2 @@
+header-y := asound_fm.h hdsp.h hdspm.h sfnt_info.h sscape_ioctl.h
+unifdef-y := asequencer.h asound.h emu10k1.h sb16_csp.h