net/nebula-matrix: add minimum nbl build framework

This patch adds the minimum build infrastructure:
1. Add Kconfig, Makefile and MAINTAINERS entries;
2. Add corresponding driver documentation;
3. A

net/nebula-matrix: add minimum nbl build framework

This patch adds the minimum build infrastructure:
1. Add Kconfig, Makefile and MAINTAINERS entries;
2. Add corresponding driver documentation;
3. Add PCI driver skeleton with empty stubs for nbl driver.

Note: the documentation describes the final full driver features;
implementation will be added in subsequent patches of this series.

Signed-off-by: illusion wang <illusion.wang@nebula-matrix.com>
Link: https://patch.msgid.link/20260914123429.56596-2-illusion.wang@nebula-matrix.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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