clk: clk-conf: support assigned-clock-rates-u64

i.MX95 System Management Control Firmware(SCMI) manages the clock
function, it exposes PLL VCO which could support up to 5GHz rate that
exceeds UINT32_MAX. So add assigned-clock-rates-u64 support
to set rate that exceeds UINT32_MAX.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/20240804-clk-u64-v4-2-8e55569f39a4@nxp.com


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