machines: pin celestica cls_ds4101 kernel to 5.4.86

cls_ds4101 carries kernel patches (cls-lpc-basecpld, enable-kernel-spcr)
but pinned no kernel version, so it floated on the default.  The toolchain
milestone bumped the default to 6.18 LTS, which its older patches do not
apply to.  Pin it to 5.4.86 -- the prior default it was already building
against -- so this change is a no-op for the platform.  Whether it still
builds on the modern toolchain is its owner's concern; this only avoids us
silently moving it off its kernel.

Signed-off-by: Brad House <bhouse@nexthop.ai>

Author: bhouse-nexthop

machine/celestica/cls_ds4101/machine.make

@@ -101,8 +101,11 @@ CONSOLE_DEV = 0
 # Include additional files in the installer image.  This is useful to
 # share code between the ONIE run-time and the installer.
 UPDATER_IMAGE_PARTS_PLATFORM = $(MACHINEDIR)/rootconf/sysroot-lib-onie/test-install-sharing
-#LINUX_VERSION           = 4.9
-#LINUX_MINOR_VERSION     = 95 
+# This platform carries kernel patches written against the previous default
+# kernel, so pin it there explicitly (no behavior change) instead of letting
+# it float onto a newer default its patches would not apply to.
+LINUX_VERSION = 5.4
+LINUX_MINOR_VERSION = 86
 
 # Secure GRUB requires Secure Boot extensions
 ifeq ($(SECURE_GRUB),yes)