riscv: move riscv_noncoherent_supported() out of ZICBOM probe

riscv: move riscv_noncoherent_supported() out of ZICBOM probe

It's a bit weird to call riscv_noncoherent_supported() each time when
insmoding a module. Move the calling out of feature patch func.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230128172856.3814-2-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>