ccache.bbclass: Use ccache-native and disable ccache for native recipes

Since host's ccache is not reliable, so disable ccache for native recipes and
use ccache-native for other types of recipes. We need disable ccache for native
recipes is because ccache-native now depends on cmake-native which causes
circular dependencies, and it's not easy to break the circular.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>