arch-mips: Remove old TypeBufferArg call

TypeBufferArg was replaced by VPtr so this call is no longer needed.
This fixes the MIPS build / nightly build.

Change-Id: I3880229fa0ad87fad1ca35c136e12efc6c36ceda
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/32414
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/arch/mips/linux/process.cc

@@ -127,7 +127,6 @@ sys_setsysinfoFunc(SyscallDesc *desc, ThreadContext *tc, unsigned op,
             // SSI_IEEE_FP_CONTROL
             ConstVPtr<uint64_t> fpcr(bufPtr, tc);
             // I don't think this exactly matches the HW FPCR
-            fpcr.copyIn(tc->getVirtProxy());
             DPRINTFR(SyscallVerbose, "sys_setsysinfo(SSI_IEEE_FP_CONTROL): "
                    " setting FPCR to 0x%x\n", letoh(*fpcr));
             return 0;