Change /configfs/sdcardfs to 0770

Change-Id: I0a66f6b3ebc3dee398e4f23f5a58ebf7d62cc4c3
Bug: 69929297
Test: setenforce 0
      su
      mkdir /config/sdcardfs/test
      su u0_a0,u0_a0,u0_a0
      echo 10000 > /config/sdcardfs/test/appid
      Write should fail
Signed-off-by: Daniel Rosenberg <drosen@google.com>