virt: tdx-guest: Give the Quote buffer an explicit type

The Quote buffer is always a "struct tdx_quote_buf", but its global
pointer is a "void *". A function would have to convert it back to make
sense of it.

Declare the global with its actual type, and give it a better name.

This creates variable shadowing in wait_for_quote_completion(), so
rename its parameter for clarity.

AI was used under supervision to collect/apply feedback, review code and
workshop logs.

Signed-off-by: Peter Fang <peter.fang@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Link: https://patch.msgid.link/20260930103739.2851980-3-peter.fang@intel.com

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