target/alpha: Extract clk_helper.c from sys_helper.c

Except helper_load_pcc(), all helpers from sys_helper.c
are system-emulation specific. In preparation of restricting
sys_helper.c to system emula

target/alpha: Extract clk_helper.c from sys_helper.c

Except helper_load_pcc(), all helpers from sys_helper.c
are system-emulation specific. In preparation of restricting
sys_helper.c to system emulation, extract helper_load_pcc()
to clk_helper.c.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231207105426.49339-2-philmd@linaro.org>

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