Revert "[AArch64] Add Ampere1B scheduling/pipeline model (#81338)"

This reverts commit 0144011.

Author: ptomsich

llvm/lib/Target/AArch64/AArch64.td

@@ -837,7 +837,6 @@ include "AArch64SchedA64FX.td"
 include "AArch64SchedThunderX3T110.td"
 include "AArch64SchedTSV110.td"
 include "AArch64SchedAmpere1.td"
-include "AArch64SchedAmpere1B.td"
 include "AArch64SchedNeoverseN1.td"
 include "AArch64SchedNeoverseN2.td"
 include "AArch64SchedNeoverseV1.td"
@@ -1723,7 +1722,7 @@ def : ProcessorModel<"ampere1", Ampere1Model, ProcessorFeatures.Ampere1,
 def : ProcessorModel<"ampere1a", Ampere1Model, ProcessorFeatures.Ampere1A,
                      [TuneAmpere1A]>;
 
-def : ProcessorModel<"ampere1b", Ampere1BModel, ProcessorFeatures.Ampere1B,
+def : ProcessorModel<"ampere1b", Ampere1Model, ProcessorFeatures.Ampere1B,
                      [TuneAmpere1B]>;
 
 //===----------------------------------------------------------------------===//