regcache: Allocate and free reg_defaults on the same level

regcache: Allocate and free reg_defaults on the same level

Currently reg_defaults buffer may be allocated on two different
levels when the user provided them and we duplicate it in regcache_init()
or when user wants us to read back from HW in regcache_hw_init().
This inconsistency makes code harder to follow and maintain. Allocate
and free reg_defaults on the same level in regcache_init() to improve
the readability and maintenance efforts.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260305085449.3184020-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>