nati_x86_64_defconfig: Add support for additional storage features

[alynch-ni]

This change enables the use of remote NVMe-oF storage over RDMA. It also enables the creation of MD software RAID arrays for compatibility with arrays used on other systems.

I built the kernel locally with this change and tested it on a PXIe-8880 controller. I verified that I can mount NVMe-oF arrays connected to an RDMA capable NIC and that I can use the same software RAID arrays from a desktop Linux distribution.

[gratian]

@alynch-ni Can you regenerate the defconfig using make savedefconfig? That collapses the options that can be deduced from other config options (and makes future updates to defconfig cleaner).

The steps would be:

• make nati_x86_64_defconfig
• make menuconfig and enable the options needed
• make savedefconfig
• mv defconfig arch/x86/configs/nati_x86_64_defconfig
• update commit with new defconfig

If you are starting from the already modified defconfig in this PR you can skip the make menuconfig step.

When you run it through make savedefconfig you will notice that: CONFIG_NVME_FABRICS=m doesn't show up in the diff anymore because it is implied by the other options.

[gratian]

@alynch-ni Can you also add a comment here with what is the size delta of /lib/modules after adding these (for future reference)?

[alynch-ni]

I amended the commit to have the file as generated by make savedefconfig. The /lib/modules size increased by 1.1MB from this change.