ci: merge various l1 boot tests into same l2 boot tests

Some of the test groups have both l1 and l2 boot test groups,
considering we no longer have many boot tests which are triggered with
CI+1, its no point keeping l1 boot tests group.
Merge l1 boot tests to corresponding l2 boot tests, following groups
have been modified so far

- tf-l1-boot-tests-cortex
- tf-l1-boot-tests-gicv2
- tf-l1-boot-tests-aarch32
- tf-l1-boot-tests-bl2_el3
- tf-l1-boot-tests-juno
- tf-l1-boot-tests-misc

Change-Id: I87b9219379598a53e7dc75d57e3cfcd9393adf3a
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
20 files changed