recovery: don't use single quote

single quotes make the m4 parser think it's at the end of
a block, and generates the following compile time warning:

  external/sepolicy/recovery.te:9:WARNING 'unrecognized character' at token ''' on line 7720:

Change-Id: I2502f16f0d9ec7528ec0fc2ee65ad65635d0101b
1 file changed