ALSA: Move ALSA docbooks to be with the rest of the kernel docbooks

Move ALSA docbooks to be with the rest of the kernel docbooks and add
them to the Makefile so that they build.  Latter required a few minor
changes to alsa .tmpl files.
(I did not remove all of the trailing whitespace in the .tmpl files.)

Fixes kernel bugzilla #12726: http://bugzilla.kernel.org/show_bug.cgi?id=12726

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: documentation_man-pages@kernel-bugs.osdl.org
Cc: Nicola Soranzo <nsoranzo@tiscali.it>
Signed-off-by: Takashi Iwai <tiwai@suse.de>