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/riscv/include/asm/setjmp.h b/arch/riscv/include/asm/setjmp.h
index 72383d4..08687e0 100644
--- a/arch/riscv/include/asm/setjmp.h
+++ b/arch/riscv/include/asm/setjmp.h
@@ -3,13 +3,9 @@
  * (C) Copyright 2018 Alexander Graf <agraf@suse.de>
  */
 
-#ifndef _SETJMP_H_
-#define _SETJMP_H_	1
+#ifndef _ASM_SETJMP_H_
+#define _ASM_SETJMP_H_	1
 
-/*
- * This really should be opaque, but the EFI implementation wrongly
- * assumes that a 'struct jmp_buf_data' is defined.
- */
 struct jmp_buf_data {
 	/* x2, x8, x9, x18, x19, x20, x21, x22, x23, x24, x25, x26, x27, sp */
 	unsigned long s_regs[12];	/* s0 - s11 */
@@ -17,9 +13,4 @@
 	unsigned long sp;
 };
 
-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_ */