libnl-tiny: Remove GENL_ID_GENERATE

This constant was always defined to 0, and recently got removed in
upstream commit a07ea4d9941af5a0c6f0be2a71b51ac9c083c5e5 ("genetlink: no
longer support using static family IDs")

Fixes libnl-tiny builds with latest upstream kernels.

Fixes: d723f2573a ("libnl-tiny: remove include/linux overrides to fix various build issues")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

package/libs/libnl-tiny/src/include/netlink/genl/family.h

@@ -62,7 +62,7 @@ static inline unsigned int genl_family_get_id(struct genl_family *family)
 	if (family->ce_mask & FAMILY_ATTR_ID)
 		return family->gf_id;
 	else
-		return GENL_ID_GENERATE;
+		return 0;
 }
 
 static inline void genl_family_set_id(struct genl_family *family, unsigned int id)