IntelFrameworkModulePkg BdsDxe: Remove redundant functions

The redundant functions which are never called have been
removed. They are GetProducerString,ChangeVariableDevicePath,
EfiReallocatePool,Var_UpdateAllConsoleOption and BOpt_IsEfiApp.
https://bugzilla.tianocore.org/show_bug.cgi?id=1063

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: shenglei <shenglei.zhang@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

IntelFrameworkModulePkg/Universal/BdsDxe/FrontPage.h

@@ -198,23 +198,6 @@ InitializeFrontPage (
   IN BOOLEAN    InitializeHiiData
   );
 
-/**
-  Acquire the string associated with the ProducerGuid and return it.
-
-
-  @param ProducerGuid    - The Guid to search the HII database for
-  @param Token           - The token value of the string to extract
-  @param String          - The string that is extracted
-
-  @retval  EFI_SUCCESS  The function returns EFI_SUCCESS always.
-
-**/
-EFI_STATUS
-GetProducerString (
-  IN      EFI_GUID                  *ProducerGuid,
-  IN      EFI_STRING_ID             Token,
-  OUT     CHAR16                    **String
-  );
 
 /**
   This function is the main entry of the platform setup entry.