yocto/oeqa: Fix HIPC/PTP virtualization test assignment

81ae99bb refactored the test assignment variables in
arm_auto_solutions_image_features.bbclass, but incorrectly assigned the
baremetal HIPC and PTP test cases when running the virtualization
architecture.

Fix the assignment by running test_30_hipc and test_30_ptp only on
baremetal and test_30_hipc_virtualization and test_30_ptp_virtualization
only on virtualization.

Signed-off-by: Peter Hoyes <peter.hoyes@arm.com>