autoport: Update documentation to mention runtime prerequisites

Change-Id: I3b5fe953fa0e00fb827b66963d69f32d63a07b16
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/10369
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
1 file changed