riscv: Fix unaligned access info messages

Ensure we only print messages about command line parameters when
the parameters are actually in use. Also complain about the use
of the vector parameter when vector support isn't available.

Fixes: aecb09e0 ("riscv: Add parameter for skipping access speed tests")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Closes: https://lore.kernel.org/all/CAMuHMdVEp2_ho51gkpLLJG2HimqZ1gZ0fa=JA4uNNZjFFqaPMg@mail.gmail.com/
Closes: https://lore.kernel.org/all/CAMuHMdWVMP0MYCLFq+b7H_uz-2omdFiDDUZq0t_gw0L9rrJtkQ@mail.gmail.com/


Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20250409153650.84433-2-ajones@ventanamicro.com


Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>