random_fortuna, random_other: unbreak standalone module build

This is direct commit to stable/12 as newer branches
do not have the problem.

PR:		263750
Reviewed by:	emaste
Tested by:	Julian H. Stacey <jhs at berklix.com>

sys/modules/random_fortuna/Makefile

@@ -6,6 +6,6 @@ KMOD	= random_fortuna
 SRCS	= randomdev.c hash.c fortuna.c
 SRCS	+= opt_param.h bus_if.h device_if.h
 SRCS	+= opt_ddb.h
-CFLAGS	+= -DRANDOM_LOADABLE
+CFLAGS	+= -DDEV_RANDOM -DRANDOM_LOADABLE
 
 .include <bsd.kmod.mk>

sys/modules/random_other/Makefile

@@ -6,6 +6,6 @@ KMOD	= random_OTHER
 SRCS	= randomdev.c hash.c other_algorithm.c
 SRCS	+= opt_param.h bus_if.h device_if.h
 SRCS	+= opt_ddb.h
-CFLAGS	+= -DRANDOM_LOADABLE
+CFLAGS	+= -DDEV_RANDOM -DRANDOM_LOADABLE
 
 .include <bsd.kmod.mk>