Fix the new keyguard check in CDM on HSUM builds

KeyguardManager.isKeyguardSecure is user-aware and checks for
INTERACT_ACROSS_USERS permission. On HSUM devices the caller
userId and the userId of the system context are different

Change-Id: Ibc7acc68d256c801741033628686bb1950f6686b
Fix: 393382525
Test: atest with HSUM target
Flag: EXEMPT test fix