clk: sifive: make SiFive clk drivers depend on ARCH_ symbols

As part of converting RISC-V SOC_FOO symbols to ARCH_FOO to match the
use of such symbols on other architectures, convert the SiFive clk
drivers to use the new symbol.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230406-groovy-trustable-15853ac0a130@spud


Signed-off-by: Stephen Boyd <sboyd@kernel.org>