base: Finish deprecating SatCounter

SatCounter has been marked as deprecated for at least 2 versions,
so it can be removed.

Change-Id: Iffb75822cc0d09d8b7d9b86828b26198865ce407
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54523
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/src/base/sat_counter.hh b/src/base/sat_counter.hh
index 6644b05..a607c4c 100644
--- a/src/base/sat_counter.hh
+++ b/src/base/sat_counter.hh
@@ -340,9 +340,6 @@
 typedef GenericSatCounter<uint64_t> SatCounter64;
 /** @} */
 
-[[deprecated("Use SatCounter8 (or variants) instead")]]
-typedef SatCounter8 SatCounter;
-
 } // namespace gem5
 
 #endif // __BASE_SAT_COUNTER_HH__