tools: ynl: fix header guards

devlink and ethtool have a trailing _ in the header guard. I must have
copy/pasted it into new guards, assuming it's a headers_install artifact.

This fixes build if system headers are old.

Fixes: 8f109e91 ("tools: ynl: include dpll and mptcp_pm in C codegen")
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Link: https://lore.kernel.org/r/20240222234831.179181-1-kuba@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/Makefile.deps

@@ -15,9 +15,9 @@ UAPI_PATH:=../../../../include/uapi/
 get_hdr_inc=-D$(1) -include $(UAPI_PATH)/linux/$(2)
 
 CFLAGS_devlink:=$(call get_hdr_inc,_LINUX_DEVLINK_H_,devlink.h)
-CFLAGS_dpll:=$(call get_hdr_inc,_LINUX_DPLL_H_,dpll.h)
+CFLAGS_dpll:=$(call get_hdr_inc,_LINUX_DPLL_H,dpll.h)
 CFLAGS_ethtool:=$(call get_hdr_inc,_LINUX_ETHTOOL_NETLINK_H_,ethtool_netlink.h)
 CFLAGS_handshake:=$(call get_hdr_inc,_LINUX_HANDSHAKE_H,handshake.h)
-CFLAGS_mptcp_pm:=$(call get_hdr_inc,_LINUX_MPTCP_PM_H_,mptcp_pm.h)
+CFLAGS_mptcp_pm:=$(call get_hdr_inc,_LINUX_MPTCP_PM_H,mptcp_pm.h)
 CFLAGS_netdev:=$(call get_hdr_inc,_LINUX_NETDEV_H,netdev.h)
 CFLAGS_nfsd:=$(call get_hdr_inc,_LINUX_NFSD_NETLINK_H,nfsd_netlink.h)