config.xml: pin SurfaceFlinger

as ag/13364183, system_service needs read access SurfaceFlinger.
Pin it by pinner when booting.

Bug: 193442970
Test: adb shell dumpsys pinner
 - SurfaceFlinger pinned
 --
    /system/bin/surfaceflinger 7028736
 --

Change-Id: I2cae8f87a09b4871cf967fe8a3c01fb9015d58cb
1 file changed