refactor(bl2): make post image handling platform-specific

In certain instances a platform may need to make modifications to an
image after it has been loaded by BL2. The existing common
implementation is a thin wrapper for a more generic arm post image
handler. To enable platforms to make changes to images when
they're loaded, move this into platform code.

Change-Id: I44025391056adb2d8a8eb4ea5984257b02027181
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
5 files changed