SecurityPkg: Add a PCD to skip Opal password prompt

https://bugzilla.tianocore.org/show_bug.cgi?id=1484
Add a PCD for skipping password prompt and device unlock flow.
so that other pre-OS applications are able to take over Opal
devices unlock flow.

Cc: Chao Zhang <chao.b.zhang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Maggie Chu <maggie.chu@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>

SecurityPkg/Tcg/Opal/OpalPassword/OpalDriver.c

@@ -988,6 +988,10 @@ OpalDriverRequestPassword (
 
     IsLocked = OpalDeviceLocked (&Dev->OpalDisk.SupportedAttributes, &Dev->OpalDisk.LockingFeature);
 
+    if (IsLocked && PcdGetBool (PcdSkipOpalDxeUnlock)) {
+      return;
+    }
+
     while (Count < MAX_PASSWORD_TRY_COUNT) {
       Password = OpalDriverPopUpPasswordInput (Dev, PopUpString, NULL, &PressEsc);
       if (PressEsc) {