clk: mstar: Allow MStar clk drivers to be compile tested

Allow COMPILE_TEST to also build the MStar clk drivers
instead of only building them when ARCH_MSTARV7 is selected.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20210215115710.3762276-1-daniel@0x0f.com


[sboyd@kernel.org: Drop regmap select too]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>