docs(context-mgmt): remove redundant information

The details specified under "Design" section with regard to
enhancing the context_management library specifies the information
on introducing root_context.

This design has been through several discussions and based on its
outcome, library has been enhanced.

The updated information covering all the aspects with regard to
implementation is listed under "Components" section.
https://trustedfirmware-a.readthedocs.io/en/latest/components/context-management-library.html

Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Change-Id: I2cf3ccd8cd94444b90fdc627f45a72a4b6096638
2 files changed