cpufreq: ti-cpufreq: add support for AM62L3 SoC

cpufreq: ti-cpufreq: add support for AM62L3 SoC

Add CPUFreq support for the AM62L3 SoC with the appropriate
AM62L3 speed grade constants according to the datasheet [1].

This follows the same architecture-specific implementation pattern
as other TI SoCs in the AM6x family.

While at it, also sort instances where the SOC family names
were not sorted alphabetically.

[1] https://www.ti.com/lit/pdf/SPRSPA1

Signed-off-by: Dhruva Gole <d-gole@ti.com>
Reviewed-by: Kendall Willis <k-willis@ti.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>