db845c: Enable earlycon on bootargs

While earlycon doesn't help when the serial driver is a module,
enable earlycon in the boot arguments so we can be able to
debug some of the issues folks are seeing with boots failing.

Change-Id: Ib46b12e2f6c5c44092935742837253128559890a
Signed-off-by: John Stultz <john.stultz@linaro.org>
1 file changed