xhci: Remove unused defines for ERST_SIZE and ERST_ENTRIES

We don't want those around confusing people.

ERST_NUM_SEGS is used both when allocating event ring segments, and when
allocating entries in the event ring segment table (erst).

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210617150354.1512157-2-mathias.nyman@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>