devlink: push shared buffer related code into separate file

Cut out another chunk from leftover.c and put sb related code
into a separate file.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20230828061657.300667-4-jiri@resnulli.usSigned-off-by: Jakub Kicinski <kuba@kernel.org>

net/devlink/Makefile

 # SPDX-License-Identifier: GPL-2.0
 
-obj-y := leftover.o core.o netlink.o netlink_gen.o dev.o port.o health.o
+obj-y := leftover.o core.o netlink.o netlink_gen.o dev.o port.o sb.o health.o \

net/devlink/devl_internal.h

@@ -220,6 +220,15 @@ int devlink_nl_cmd_port_unsplit_doit(struct sk_buff *skb,
 				     struct genl_info *info);
 int devlink_nl_cmd_port_new_doit(struct sk_buff *skb, struct genl_info *info);
 int devlink_nl_cmd_port_del_doit(struct sk_buff *skb, struct genl_info *info);
+int devlink_nl_cmd_sb_pool_set_doit(struct sk_buff *skb, struct genl_info *info);
+int devlink_nl_cmd_sb_port_pool_set_doit(struct sk_buff *skb,
+					 struct genl_info *info);
+int devlink_nl_cmd_sb_tc_pool_bind_set_doit(struct sk_buff *skb,
+					    struct genl_info *info);
+int devlink_nl_cmd_sb_occ_snapshot_doit(struct sk_buff *skb,
+					struct genl_info *info);
+int devlink_nl_cmd_sb_occ_max_clear_doit(struct sk_buff *skb,
+					 struct genl_info *info);
 int devlink_nl_cmd_health_reporter_set_doit(struct sk_buff *skb,
 					    struct genl_info *info);
 int devlink_nl_cmd_health_reporter_recover_doit(struct sk_buff *skb,