x86/sgx: Remove superfluous asterisk from copyright comment in asm/sgx.h

x86/sgx: Remove superfluous asterisk from copyright comment in asm/sgx.h

Drop an asterisk from a file-level copyright comment so that the comment
isn't intrepeted as a kernel-doc comment.

E.g. if arch/x86/include/asm/sgx.h is fed into kernel-doc processing:

  WARNING: ./arch/x86/include/asm/sgx.h:2 This comment starts with '/**',
  but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://patch.msgid.link/20251112160708.1343355-5-seanjc%40google.com