clk: stm32: Do not enable by default during compile testing

clk: stm32: Do not enable by default during compile testing

Enabling the compile test should not cause automatic enabling of all
drivers.  Restrict the default to ARCH also for individual driver, even
though its choice is not visible without selecting parent Kconfig
symbol, because otherwise selecting parent would select the child during
compile testing.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250404-kconfig-defaults-clk-v1-3-4d2df5603332@linaro.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>