feat(docs): save BL32 image base and size in entry point info

There is no platform function to retrieve the info in the generic code.
Populate the BL32 image base, size and max limit in arg2, arg3 and arg4.

Signed-off-by: Nishant Sharma <nishant.sharma@arm.com>
Change-Id: I35527fb41829102083b488a5150c0c707c5ede15
1 file changed