unit_test: Regenerate mocks for fwk_interrupt.h

The existing mocks available for the fwk_interrupt.h
were not generated with the callback and return_thru_ptr
plugins. These plugins are already enabled in
unit_test/cfg.yml file. This patch adds regenerated
mocks for fwk_interrupt.h with these updated settings.
Callback plugin enables mock to call supplied callback
function whereas return_thru_ptr provides mechanism
to return values through pointer arguments.

Change-Id: I82373ac48cf80813d46d9ee8c88bff908c2ec9cc
Signed-off-by: Girish Pathak <girish.pathak@arm.com>