ASoC: nau8825: Replace copied'n'pasted intlog10()

As the code even references to dvb_math.c, which is now available
as int_log.c, replace its content by the calling respective API.

Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/20230619172019.21457-5-andriy.shevchenko@linux.intel.com


Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230703135211.87416-5-andriy.shevchenko@linux.intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>