MdeModulePkg/DxeCapsuleLibFmp: Fix build failure issues

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

MdeModulePkg/Library/DxeCapsuleLibFmp/DxeCapsuleLib.c

@@ -47,6 +47,9 @@
 #include <Protocol/FirmwareManagement.h>
 #include <Protocol/DevicePath.h>
 
+extern EFI_SYSTEM_RESOURCE_TABLE *mEsrtTable;
+extern BOOLEAN                   mIsVirtualAddrConverted;
+
 BOOLEAN                   mDxeCapsuleLibEndOfDxe       = FALSE;
 EFI_EVENT                 mDxeCapsuleLibEndOfDxeEvent  = NULL;