gn_base.bbclass: Use the ninja bbclass

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-oniro-staging/classes/gn_base.bbclass

@@ -4,7 +4,9 @@
 
 # This class allows building GN-based projects.
 
-DEPENDS += "gn-native ninja-native"
+DEPENDS += "gn-native"
+
+inherit ninja
 
 # General GN options, like --dotfile
 GN_OPTIONS ??= ""