Fix KM VTS tests for Strongbox implementations

Modify RSA keysize used in various tests
to ensure both TEE and Strongbox implementations
can be validated.
Skip invalid keysizes that Strongbox does not
support.

Test: Patches the strongbox tests
Bug: 112189538
Bug: 119172331
Change-Id: I46ab01ce9b8224403e2a334a894967761d6799c9
Signed-off-by: Max Bires <jbires@google.com>
(cherry picked from commit 88a376b0)