tools: ynl: auto-gen for all genetlink families

Instead of listing the genetlink families that we want to codegen
for, always codegen for everyone. We can add an opt-out later but
it seems like most families are not causing any issues, and yet
folks forget to add them to the Makefile.
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240202004926.447803-4-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/generated/Makefile

@@ -14,7 +14,10 @@ YNL_GEN_ARG_ethtool:=--user-header linux/ethtool_netlink.h \
 
 TOOL:=../ynl-gen-c.py
 
-GENS:=ethtool devlink dpll handshake fou mptcp_pm netdev nfsd ovs_datapath ovs_vport ovs_flow
+GENS_PATHS=$(shell grep -nrI --files-without-match \
+		'protocol: netlink' \
+		../../../../Documentation/netlink/specs/)
+GENS=$(patsubst ../../../../Documentation/netlink/specs/%.yaml,%,${GENS_PATHS})
 SRCS=$(patsubst %,%-user.c,${GENS})
 HDRS=$(patsubst %,%-user.h,${GENS})
 OBJS=$(patsubst %,%-user.o,${GENS})