regmap: kunit: Replace a kmalloc/kfree() pair with KUnit-managed alloc

Replace the kmalloc() and kfree() in raw_read_defaults() with a
kunit_kmalloc() so that KUnit will free it automatically.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://msgid.link/r/20240408144600.230848-10-rf@opensource.cirrus.com


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