cpufreq: dt-platdev: Add ti,am62l3 to blocklist

cpufreq: dt-platdev: Add ti,am62l3 to blocklist

Add AM62L3 SoC to the dt-platdev blocklist to ensure proper handling
of CPUFreq functionality. The AM62L3 will use its native TI CPUFreq
driver implementation instead of the generic dt-platdev driver.

This follows the same pattern as other TI SoCs like AM62A7, AM62D2,
and AM62P5 which have been previously added to this blocklist.

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