linux: module: weld all but spl.ko into zfs.ko

Originally it was thought it would be useful to split up the kmods
by functionality.  This would allow external consumers to only load
what was needed.  However, in practice we've never had a case where
this functionality would be needed, and conversely managing multiple
kmods can be awkward.  Therefore, this change merges all but the
spl.ko kmod in to a single zfs.ko kmod.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13274

include/os/freebsd/spl/sys/ccompile.h

@@ -42,9 +42,6 @@ extern "C" {
 #endif
 
 #define	EXPORT_SYMBOL(x)
-#define	MODULE_AUTHOR(s)
-#define	MODULE_DESCRIPTION(s)
-#define	MODULE_LICENSE(s)
 #define	module_param(a, b, c)
 #define	module_param_call(a, b, c, d, e)
 #define	module_param_named(a, b, c, d)

include/os/freebsd/spl/sys/mod_os.h

@@ -31,11 +31,6 @@
 
 #include <sys/sysctl.h>
 
-#define	ZFS_MODULE_DESCRIPTION(s)
-#define	ZFS_MODULE_AUTHOR(s)
-#define	ZFS_MODULE_LICENSE(s)
-#define	ZFS_MODULE_VERSION(s)
-
 #define	EXPORT_SYMBOL(x)
 #define	module_param(a, b, c)
 #define	MODULE_PARM_DESC(a, b)