OvmfPkg: QemuFlashFvbServicesRuntimeDxe: clean up includes and libraries

Before introducing the SMM driver interface, clean up #include directives
and [LibraryClasses] by:
- removing what's not directly used (HobLib and UefiLib),
- adding what's used but not spelled out (DevicePathLib),
- sorting the result.

This helps with seeing each source file's dependencies and with
determining the library classes for the SMM driver.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18672 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FvbServicesRuntimeDxe.inf

@@ -46,17 +46,16 @@
   OvmfPkg/OvmfPkg.dec
 
 [LibraryClasses]
-  UefiBootServicesTableLib
-  MemoryAllocationLib
-  BaseMemoryLib
-  HobLib
-  DebugLib
-  UefiRuntimeLib
-  DxeServicesTableLib
   BaseLib
-  UefiDriverEntryPoint
-  UefiLib
+  BaseMemoryLib
+  DebugLib
+  DevicePathLib
+  DxeServicesTableLib
+  MemoryAllocationLib
   PcdLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+  UefiRuntimeLib
 
 [Guids]
   gEfiEventVirtualAddressChangeGuid   # ALWAYS_CONSUMED