docs: update RESET_TO_BL31 documentation

The documentation has been updated to explicitly mention that with
RESET_TO_BL31, the platform can receive parameters based on their
actual boot sequence.

Change-Id: Ib482fb89e528ec836ff7ee175cac59dd2da2898b
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
1 file changed