Update API whitelist supported by parent profile

1) Add #getPasswordMaximumLength() to the whitelist supported by the
parent profile
2) Throw SecurityException when #isAdminActive() is called on parent
profile

Change-Id: Idcc3ef48ce83963fcaa0259ec5f5781d95c83afa
Fixes: 32063080
Test: cts-tradefed run cts --module DevicePolicyManager --test com.android.cts.devicepolicy.ManagedProfileTest#testParentProfileApiDisabled