Disable the GDB stub by default

I would prefer to see the exception dump on serial rather than cryptic
GDB protocol.

Change-Id: Ib25513d33e6a31da24586fecb00adb5206bb43bd
Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Reviewed-on: http://review.coreboot.org/811
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Tested-by: build bot (Jenkins)
1 file changed