sept: Add support for loading sept from fss0

If `fss0=` key is detected, sept will be loaded from fusee-secondary.bin instead of `sept/sept_*`.

This will negate missing sept and failed to decrypt pkg2 errors, when booting HOS, for users that forget to update sept folder.

bootloader/hos/fss.h

@@ -19,6 +19,16 @@
 
 #include "hos.h"
 
-int parse_fss(launch_ctxt_t *ctxt, const char *path);
+typedef struct _fss0_sept_t
+{
+	u32 kb;
+	ini_sec_t *cfg_sec;
+	void *sept_primary;
+	void *sept_secondary;
+
+} fss0_sept_t;
+
+int parse_fss(launch_ctxt_t *ctxt, const char *path, fss0_sept_t *sept_ctxt);
+int load_sept_from_ffs0(fss0_sept_t *sept_ctxt);
 
 #endif