The A55 clock logic as below:
     A55_PLL ----------------->\
                                A55_SEL-->A55_CORE
     A55_CCM_ROOT--->A55_GATE->/

Add A55 CPU clk to support freq change.
Add NIC CLK to reflect the clk status
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20230403095300.3386988-8-peng.fan@oss.nxp.comSigned-off-by: Abel Vesa <abel.vesa@linaro.org>