Add mpr driver into GENERIC64LE configuration.

Fixes after review. Make mps_read_extended_config_page return IOCStatus already byte-swapped. Other missing swaps fixed. Updated man page with TODO about flash operations not working on BE.

Any comment on this?

Someone any additional comment on this?

Review fixes.

Review comments fixes.

Comments and indentation.

In D23401#554073, @arichardson wrote:

This commit appears to have broken using QEMU MALTA (MIPS64 BE) with -device virtio-rng-pci.
With this change I get an infinite loop on boot that goes away if I revert it:

In D23990#533631, @jhibbits wrote:

What do you plan to do to continue this work?

Print information message about number of bpvo pool entries and memory used by this pool when booting in verbose mode.

Style (indentation, comparison) fixes.

Adjust moea64_bpvo_pool_size value only if hw_direct_map is false, otherwise set it to previous hard-coded value.

Removing blank line.

Removing extra white spaces.

Thanks @bryanv for the review.

Use the vtpci_write_config in vtpci_write_header macros for consistency. Typo fixes.

Use functions htole16 and htole32 when writing VirtIO header instead of le16toh and le32toh for better comprehension.

In D23401#513986, @alfredo.junior_eldorado.org.br wrote:

nice job @afscoelho_gmail.com !
I just tried your patch in a image uploaded to a POWER8 instance at https://openpower.ic.unicamp.br/minicloud/ and it worked out of the box.
Please check my comment on the diff.

In D23401#513326, @bdragon wrote:

Ohhhhhh, so THAT is why this has been such a headache?

This is an awesome find.