[PATCH] add consts where appropriate in sound/pci/hda/*

[Denys Vlasenko <vda.linux@googlemail.com>]

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Hi Takashi,

There is a lot of data structures in that code,
and most of them seems to be read-only.

I added const modifiers to most of such places:

   text    data     bss     dec     hex filename
 106315  179564      36  285915   45cdb snd-hda-intel.o
 283051    2624      36  285711   45c0f snd-hda-intel_patched.o

Patch is attached.

It moves "static struct hda_codec_preset *hda_preset_tables[]"
from hda_patch.h to hda_codec.c, and then adds
#include "hda_patch.h"
in a few .c files so that definitions of e.g.
const struct hda_codec_preset snd_hda_preset_analog[]
are checked to match declarations in hda_patch.h

The rest of the patch (bulk of it) adds "const"
in many places.

Patch is compile tested. Please apply.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
--
vda

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