ASoC: codecs: pcm512x: only print info once on no sclk

ASoC: codecs: pcm512x: only print info once on no sclk

If sclk is not provided the driver falls back to using bclk and prints
an info message in the system log. Under normal operations the message
is repeated many times:

[   17.929576] pcm512x 0-004c: No SCLK, using BCLK: -2
[   17.949172] pcm512x 0-004c: No SCLK, using BCLK: -2
[   17.953029] pcm512x 0-004c: No SCLK, using BCLK: -2
[   17.965059] pcm512x 0-004c: No SCLK, using BCLK: -2
[   82.592980] pcm512x 0-004c: No SCLK, using BCLK: -2
[   82.866293] pcm512x 0-004c: No SCLK, using BCLK: -2

Switch from dev_info to dev_info_once to reduce log noise.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://patch.msgid.link/20260625122811.4056274-1-christianshewitt@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>