[amdsbwd] teach amdsbwd that it has options

AMDSBWD_DEBUG was previously checked for as a #define but it was not
possible to define it

Reviewed by:	kevans
Discussed with:	kenm

sys/conf/options

@@ -1006,3 +1006,6 @@ EKCD		opt_ekcd.h
 
 # NVME options
 NVME_USE_NVD	opt_nvme.h
+
+# amdsbwd options
+AMDSBWD_DEBUG	opt_amdsbwd.h

sys/dev/amdsbwd/amdsbwd.c

@@ -49,6 +49,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_amdsbwd.h"
+
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/module.h>