x86/gsseg: Add the new <asm/gsseg.h> header to <asm/asm-prototypes.h>

Module build needs to be able to pick up the C prototype:

  WARNING: modpost: EXPORT symbol "asm_load_gs_index" [vmlinux] version generation failed, symbol will not be versioned.
  Is "asm_load_gs_index" prototyped in <asm/asm-prototypes.h>?

Fixes: ae53fa1 ("x86/gsseg: Move load_gs_index() to its own new header file")
Reported-by: Stephen Rothwell <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Cc: [email protected]

Author: Ingo Molnar

arch/x86/include/asm/asm-prototypes.h

@@ -12,6 +12,7 @@
 #include <asm/special_insns.h>
 #include <asm/preempt.h>
 #include <asm/asm.h>
+#include <asm/gsseg.h>
 
 #ifndef CONFIG_X86_CMPXCHG64
 extern void cmpxchg8b_emu(void);