Plaform: AN521: Introduce platform binding HAL

This API (tfm_hal_bind_boundaries) binds partition with platform by
a p_boundaries handle, to let platform records partition info and
apply specific settings. Check the API comment for details.

The patch also:

- Updates the boundary update HAL API.
- Updates the HAL design document.
- Removes the FIH on AN521.

Change-Id: I77bba50d16fc6bb034aff3f4a7a8dfefecf345ec
Signed-off-by: Ken Liu <Ken.Liu@arm.com>
Co-authored-by: Mingyang Sun <mingyang.sun@arm.com>
15 files changed