x86/microcode/intel: Support mailbox transfer

The functions for sending microcode data and retrieving the next offset
were previously placeholders, as they need to handle a specific mailbox
format.

While the kernel supports similar mailboxes, none of them are compatible
with this one. Attempts to share code led to unnecessary complexity, so
add a dedicated implementation instead.

  [ bp: Sort the include properly. ]

Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Tested-by: Anselm Busse <abusse@amazon.de>
Link: https://lore.kernel.org/20250320234104.8288-1-chang.seok.bae@intel.com

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