Flush debug output before handshaking
Flush debug output before handshaking

Several simulation results shows the debug message were cut short.
Looks like it is because the debug output did not get out before
handshaking with test controller, which ends the test.
So flush the message out before handshaking with test controller.

Testing Done:   Not really tested. Needs to see the result from
                Toshiba's simulation. Made sure the build is not
                broken.
Bug Number:     Trivial
Review URL:     https://reviews.leaflabs.com/r/1806/
Reviewed by:    Morgan Girling <girling_morgan@projectara.com>
                Eli Sennesh <esennesh@leaflabs.com>

Signed-off-by:  Jun Li <4a139eac5426aee89571cee0a0f52cc73d82e960@projectara.com>

projectara/bootrom,gregkh/bootrom