[RISCV] Remove +experimental-zfbfmin from the testcases for Zvfbfmin intrinsics. NFC. (#76317)

Zvfbfmin doesn't need Zfbfmin also enabled.

Author: tclin914

llvm/test/CodeGen/RISCV/rvv/vfncvtbf16-f-f.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: sed 's/iXLen/i32/g' %s | llc -mtriple=riscv32 -mattr=+v,+experimental-zfbfmin,+experimental-zvfbfmin \
+; RUN: sed 's/iXLen/i32/g' %s | llc -mtriple=riscv32 -mattr=+v,+experimental-zvfbfmin \
 ; RUN:   -verify-machineinstrs -target-abi=ilp32d | FileCheck %s
-; RUN: sed 's/iXLen/i64/g' %s | llc -mtriple=riscv64 -mattr=+v,+experimental-zfbfmin,+experimental-zvfbfmin \
+; RUN: sed 's/iXLen/i64/g' %s | llc -mtriple=riscv64 -mattr=+v,+experimental-zvfbfmin \
 ; RUN:   -verify-machineinstrs -target-abi=lp64d | FileCheck %s
 
 declare <vscale x 1 x bfloat> @llvm.riscv.vfncvtbf16.f.f.w.nxv1bf16.nxv1f32(

llvm/test/CodeGen/RISCV/rvv/vfwcvtbf16-f-f.ll

@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: sed 's/iXLen/i32/g' %s | llc -mtriple=riscv32 -mattr=+v,+experimental-zfbfmin,+experimental-zvfbfmin \
+; RUN: sed 's/iXLen/i32/g' %s | llc -mtriple=riscv32 -mattr=+v,+experimental-zvfbfmin \
 ; RUN:   -verify-machineinstrs -target-abi=ilp32d | FileCheck %s
-; RUN: sed 's/iXLen/i64/g' %s | llc -mtriple=riscv64 -mattr=+v,+experimental-zfbfmin,+experimental-zvfbfmin \
+; RUN: sed 's/iXLen/i64/g' %s | llc -mtriple=riscv64 -mattr=+v,+experimental-zvfbfmin \
 ; RUN:   -verify-machineinstrs -target-abi=lp64d | FileCheck %s
 
 declare <vscale x 1 x float> @llvm.riscv.vfwcvtbf16.f.f.v.nxv1f32.nxv1bf16(