[A/B update] A/B编译宏添加

Signed-off-by: Nwang_yonghai <wang_yonghai@hoperun.com>

hb_internal/preloader/preloader.py

@@ -362,6 +362,8 @@ class MyProduct():
             build_vars['product_company'] = config.get('device_company')
         if 'enable_ramdisk' in config:
             build_vars['enable_ramdisk'] = config.get('enable_ramdisk')
+        if 'enable_absystem' in config:
+            build_vars['enable_absystem'] = config.get('enable_absystem')
         if 'build_selinux' in config:
             build_vars['build_selinux'] = config.get('build_selinux')
         if 'build_seccomp' in config: