arm: mach-k3: am62p: Fixup a53 max cpu frequency by speed-grade

AM62P SoC has multiple speed grades. Add function to delete
non-relevant CPU frequency nodes, based on the information
retrieved from hardware registers. Fastest grade's maximum
frequency also depends on PMIC voltage, hence to simplify
implementation use the smaller value.

Signed-off-by: Aparna Patra <a-patra@ti.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
2 files changed