x86/tdx: Remove 'struct tdx_hypercall_args'

Now 'struct tdx_hypercall_args' is basically 'struct tdx_module_args'
minus RCX.  Although from __tdx_hypercall()'s perspective RCX isn't
used as shared register thus not part of input/output registers, it's
not worth to have a separate structure just due to one register.

Remove the 'struct tdx_hypercall_args' and use 'struct tdx_module_args'
instead in __tdx_hypercall() related code.  This also saves the memory
copy between the two structures within __tdx_hypercall().

Suggested-by: Peter Zijlstra <[email protected]>
Signed-off-by: Kai Huang <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Reviewed-by: Kirill A. Shutemov <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lore.kernel.org/all/798dad5ce24e9d745cf0e16825b75ccc433ad065.1692096753.git.kai.huang%40intel.com

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