arm: mach-k3: am62a: Simplify the logic for QOS reg and val propagation

arm: mach-k3: am62a: Simplify the logic for QOS reg and val propagation

For the QOS registers, instead of using the raw values for calculation
for each reg field, use a defined macro which takes in argument for all
the reg fields to get the desired value.
Do the similar simplification for QOS register and group registers and
make the corresponding changes for am62a_qos_uboot file.

Suggested-by: Andrew Davis <afd@ti.com>
Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Acked-by: Andrew Davis <afd@ti.com>