build: gate defs.h inclusion behind a macro

Should allow us to use slrt.h in skinit.c when building for coreboot.

Signed-off-by: Marty E. Plummer <hanetzer@startmail.com>

Author: hanetzer

include/skl/slrt.h

@@ -1,7 +1,9 @@
 #ifndef __SLRT_H__
 #define __SLRT_H__
 
+#ifndef __COREBOOT__
 #include <defs.h>
+#endif /* __COREBOOT__ */
 #include <types.h>
 
 struct slr_entry_hdr {
@@ -99,6 +101,8 @@ struct slr_entry_policy {
     struct slr_policy_entry policy_entries[];
 } __packed;
 
+
+#ifndef __COREBOOT__
 extern struct slr_table bootloader_data;
 
 static inline void *end_of_slrt(void)
@@ -129,5 +133,6 @@ static inline void *next_entry_with_tag(void* _t, u16 tag)
     }
     return NULL;
 }
+#endif /* __COREBOOT__ */
 
 #endif /* __SLRT_H__ */