MdeModulePkg/DriverSample: Remove the password related codes

In current DriverSampleDxe, the sample code of password is
not a good example, so we plan to remove it.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

MdeModulePkg/Universal/DriverSampleDxe/NVDataStruc.h

@@ -34,9 +34,7 @@ Revision History:
 
 #pragma pack(1)
 typedef struct {
-  UINT16  WhatIsThePassword2[20];
   UINT16  MyStringData[40];
-  UINT16  PasswordClearText[20];
   UINT16  SomethingHiddenForHtml;
   UINT8   HowOldAreYouInYearsManual;
   UINT16  HowTallAreYouManual;