regmap: Use locking during kunit tests

There is no reason to bypass the locking when running the kunit tests,
leave it enabled as standard.

Signed-off-by: Mark Brown <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/base/regmap/regmap-kunit.c

···
 	struct reg_default *defaults;
 
 	config->cache_type = param->cache;
-	config->disable_locking = config->cache_type == REGCACHE_RBTREE ||
-					config->cache_type == REGCACHE_MAPLE;
 
 	if (config->max_register == 0) {
 		config->max_register = param->from_reg;