x86/virt/seamldr: Add module update locking

TDX metadata like the version number changes during a module update.
Add functions to lock out module updates.

The current stop_machine() implementation uses worker threads. The
scheduler actually does a full, normal context switch over to that
thread. preempt_disable() obviously inhibits that context switch and
thus, locks out stop_machine() users like the module update.

Thanks to Chao for the idea of using preempt_disable().

Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>

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