kitakami-common: sepolicy: Address more critical denials

Change-Id: Ic0dc084fef55047ed942003488a064db49b101ed

sepolicy/vendor/priv_app.te

+allow priv_app alarm_boot_prop:file open;
+allow priv_app alarm_instance_prop:file getattr;
+allow priv_app device:dir open;
+allow priv_app proc:file open;
+allow priv_app proc_interrupts:file open;
+allow priv_app rootfs:dir { rmdir write };
+allow priv_app rootfs:file { create write };
+allow priv_app sysfs_android_usb:file open;

sepolicy/vendor/system_server.te

+allow system_server app_zygote:process getpgid;
 allow system_server default_android_hwservice:hwservice_manager find;
 allow system_server exported_camera_prop:file r_file_perms;
 allow system_server hal_light_default:process signal;