refactor(rss): make RSS driver standalone for Measured Boot

Currently, Measured Boot RSS driver gathers data from platform calls,
specifically RSS metadata. Generally, the driver should use the least
amount of platform calls possible, and the platform should provide the
data directly to the driver via the driver interface.

For this purpose, RSS Measured Boot driver interface APIs were updated
and platform calls were removed from RSS Measured Boot driver.

Change-Id: I6c797d9ac2d70215f32a084a7643884b399ee28c
Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
2 files changed