refactor: trim down extensive test list

Extensive tests are meant to do stress testing but currently the list
includes most of the tests from standard test and two extensive ones
related with PSCI and timer.
Since we do standard tests in quite a few configurations, no need to
test them again in extensive.

Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I0be868e1e781fd95e95908b82bd138dc7c6d32aa
1 file changed