x86/virt/tdx: Handle SEAMCALL no entropy error in common code

Some SEAMCALLs use the RDRAND hardware and can fail for the same reasons
as RDRAND.  Use the kernel RDRAND retry logic for them.

There are three __seamcall*() variants.  Do the SEAMCALL retry in common
code and add a wrapper for each of them.

Signed-off-by: Kai Huang <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Reviewed-by: Kirill A. Shutemov <[email protected]>
Reviewed-by: Kuppuswamy Sathyanarayanan <[email protected]>
Reviewed-by: Dave Hansen <[email protected]>
Link: https://lore.kernel.org/all/20231208170740.53979-4-dave.hansen%40intel.com

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