Add `KEYGUARD_DISABLE_SHORTCUTS_ALL` constant to DevicePolicyManager

KEYGUARD_DISABLE_SHORTCUTS_ALL is a new keyguard restriction that prohibits
shortcuts in the keyguard.

Bug: 242851438
Test: mp droid. cts-tradefed run commandAndExit cts-dev -m CtsAdminTestCases -t android.admin.cts.DevicePolicyManagerTest#testKeyguardDisabledFeatures
Change-Id: I7ad82a76f3a30f4a757f80978b2711e362cba086