ASoC: Intel: avs: Include missing string.h

File loader.c utilizes strscpy().

Reviewed-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://patch.msgid.link/20250530141025.2942936-10-cezary.rojewski@intel.com


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