bng_en: Initialize default configuration

Query resources from the firmware and, based on the
availability of resources, initialize the default
settings. The default settings include:
1. Rings and other resource reservations with the
firmware. This ensures that resources are reserved
before network and auxiliary devices are created.
2. Mapping the BAR, which helps access doorbells since
its size is known after querying the firmware.
3. Retrieving the TCs and hardware CoS queue mappings.

Signed-off-by: Vikas Gupta <vikas.gupta@broadcom.com>
Reviewed-by: Bhargava Chenna Marreddy <bhargava.marreddy@broadcom.com>
Reviewed-by: Rajashekar Hudumula <rajashekar.hudumula@broadcom.com>
Link: https://patch.msgid.link/20250701143511.280702-10-vikas.gupta@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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