OvmfPkg/VirtioKeyboardDxe: Drop unused functions and variables

VirtioKeyboardRingHasBuffer() and VIRTIO_KBD_DEV.KeyNotifyTimer are
defined but never called, drop them.

Signed-off-by: Jiaqing Zhao <Zhao.Jiaqing@amd.com>

OvmfPkg/VirtioKeyboardDxe/VirtioKeyboard.c

@@ -104,29 +104,6 @@ VirtioKeyboardRingSendBuffer (
   return EFI_SUCCESS;
 }
 
-// -----------------------------------------------------------------------------
-// Look for buffer ready to be processed
-BOOLEAN
-EFIAPI
-VirtioKeyboardRingHasBuffer (
-  IN OUT VIRTIO_KBD_DEV  *Dev,
-  IN     UINT16          Index
-  )
-{
-  VIRTIO_KBD_RING  *Ring   = Dev->Rings + Index;
-  UINT16           UsedIdx = *Ring->Ring.Used.Idx;
-
-  if (!Ring->Ready) {
-    return FALSE;
-  }
-
-  if (Ring->LastUsedIdx == UsedIdx) {
-    return FALSE;
-  }
-
-  return TRUE;
-}
-
 // -----------------------------------------------------------------------------
 // Get data from buffer which is marked as ready from device
 BOOLEAN

OvmfPkg/VirtioKeyboardDxe/VirtioKeyboard.h

@@ -97,7 +97,6 @@ typedef struct {
 
   // List for notifications
   LIST_ENTRY                           NotifyList;
-  EFI_EVENT                            KeyNotifyTimer;
 
   // Last pressed key
   // typedef struct {