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/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 02ad9f7..3c6c252 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -21,7 +21,7 @@
 #include <usb.h>
 #include <watchdog.h>
 #include <asm/global_data.h>
-#include <asm/setjmp.h>
+#include <setjmp.h>
 #include <linux/libfdt_env.h>
 
 DECLARE_GLOBAL_DATA_PTR;