common: coding style cleanup
arm: faraday: add ifdef for command 'bootm'

Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
arm: faraday: add do_go_exec() for command 'go'

This do_go_exec() override the default behavior to
make sure that cleanup_before_linux() always gets
invoked before transfering control.

Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
command: go: rollback