You can specify another config file in hb build like this:
  hb build --gn-args liteos_config_file=myconfig.config
file specified in liteos_config_file argument is relative
to "$product_path/kernel_configs" directory, or is an
absolute file path, for example:
  hb build --gn-args liteos_config_file=//path/to/myconfig.config
or
  hb build --gn-args liteos_config_file=/another/path/to/myconfig.config
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: I7e98604006feff9c2487e06a8f3f2a11e5de746b