Ampere: PCIe: Add support for Ampere Altra Max

This updates the platform specific PCIe modules to
add support for Ampere Altra Max processor which
features 128 PCIe Gen4 lanes (distributed across
eight x16 RCAs) using 32 controllers.

Signed-off-by: Nhi Pham <nhi@os.amperecomputing.com>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>