kselftest: futex: set color to bypass tput for riscv_64

Apply If46f053397dabb6d14bd81b50c15225150bf6903 to riscv_64 so that
futex tests pass.

Bug: 296103535
Test: Ran atest -a vts_linux_kselftest_riscv_64 against CF
Change-Id: I74ca95c93f6aa77a64afafd07c9b28ea461ef336
1 file changed