board: ti: am62dx: Separate resource management config from am62ax

board: ti: am62dx: Separate resource management config from am62ax

AM62d currently shares resource management configuration files with
AM62a. However, AM62a resource management needs to be modified for DMA
resource sharing scheme for CPSW3G Ethernet functionality to support
multi-core traffic handling.

Add separate AM62d-specific resource management configuration files to
decouple from the AM62a changes and maintain proper resource allocation
for AM62d.

Signed-off-by: Paresh Bhagat <p-bhagat@ti.com>
Reviewed-by: Anshul Dalal <anshuld@ti.com>