i386/tdx: Remove enumeration of GetQuote in tdx_handle_get_tdvmcall_info()

i386/tdx: Remove enumeration of GetQuote in tdx_handle_get_tdvmcall_info()

GHCI is finalized with the <GetQuote> being one of the base VMCALLs, and
not enuemrated via <GetTdVmCallInfo>.

Adjust tdx_handle_get_tdvmcall_info() to match with GHCI.

Opportunistically fix the wrong indentation and explicitly set the
ret to TDG_VP_VMCALL_SUCCESS (in case KVM leaves unexpected value).

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20250703024021.3559286-2-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>