x86: qemu: add a newline after "Booting from ROM.."

Under QEMU and SeaBIOS, everything gets to be printed
immediately after "Booting from ROM.." as there is no newline.
This prevents parsing QEMU console output for the very first
line where it needs to match from the beginning of the line.
So add a dummy newline here so the next output is at
the beginning of a line.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>