DuetPkg DxeIpl: Send result of PrintValue to serial port
DuetPkg DxeIpl: Send result of PrintValue to serial port

PrintValue now uses PrintString so its result will be sent to
the serial port in addition to the screen.

git-svn-id: 5648d1bec6962b0a6d1d1b40eba8cf5cdb62da3d@10951 6f19259b-4bc3-4df7-8a09-765794883524

MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2,MattDevo/edk2