CDD: Tightening kernel security requirements from SR to MUST

- The tightened MUST requirements are applicable for devices that
originally ship with API level 28 and above.

These security requirements provide better protections for the kernel by
mitigating common classes of vulnerabilities and privilege escalation
techniques.

Bug: 74078653
Bug: 79088532
Bug: 73728376
Test: n/a
Change-Id: I62450948e5474939d94b22b280d11a6d56e35f3e
1 file changed