Unify start_el3 & start_no_el3

Now that the start_el3 and start_no_el3 labels point at the same place,
unify them into a start_bootmethod label and update callers.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
5 files changed