common: clean up setjmp.h

Separate setjmp.h into an architecture independent part and an architecture
specific part. This simplifies moving from using struct jmp_buf_data
directly to using type jmp_buf in our code which is the C compliant way.

Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/arch/arm/include/asm/setjmp.h b/arch/arm/include/asm/setjmp.h
index 9a7f5af..a9eccf7 100644
--- a/arch/arm/include/asm/setjmp.h
+++ b/arch/arm/include/asm/setjmp.h
@@ -4,15 +4,11 @@
  * (C) Copyright 2016 Alexander Graf <agraf@suse.de>
  */
 
-#ifndef _SETJMP_H_
-#define _SETJMP_H_	1
+#ifndef _ASM_SETJMP_H_
+#define _ASM_SETJMP_H_	1
 
 #include <asm-generic/int-ll64.h>
 
-/*
- * This really should be opaque, but the EFI implementation wrongly
- * assumes that a 'struct jmp_buf_data' is defined.
- */
 struct jmp_buf_data {
 #if defined(__aarch64__)
 	u64  regs[13];
@@ -21,9 +17,4 @@
 #endif
 };
 
-typedef struct jmp_buf_data jmp_buf[1];
-
-int setjmp(jmp_buf jmp);
-void longjmp(jmp_buf jmp, int ret);
-
-#endif /* _SETJMP_H_ */
+#endif /* _ASM_SETJMP_H_ */