dt-bindings: soc: ti: pruss: Update bindings for K3 AM62x SoCs

Update the PRUSS bindings for the PRUSSM instance present in
AM625 SoC.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220602120613.2175-3-kishon@ti.com