[RISCV] Rename the fixed vector vwmacc tests to have the 'm' in their filenames. NFC

diff --git a/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwacc.ll b/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwmacc.ll
similarity index 100%
rename from llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwacc.ll
rename to llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwmacc.ll

diff --git a/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwaccu.ll b/llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwmaccu.ll
similarity index 100%
rename from llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwaccu.ll
rename to llvm/test/CodeGen/RISCV/rvv/fixed-vectors-vwmaccu.ll