util/lint: Update checkpatch & files to upstream linux

- Update checkpatch.pl to version 522b837
(checkpatch: warn when formats use %Z and suggest %z)

- This update moves the const_struct definitions into an external file.
coreboot will want to update this file, but for now I'm just pulling it
in directly from the linux tree.

- Update spelling.txt used by checkpatch.pl to version 505d308
(scripts/spelling.txt: add "overide" pattern and fix typo instances)

- Add better notes where things have been changed for coreboot to make
future merges easier.

Change-Id: I0ef067874fe7b1d23276a10e63858895d6083f69
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/18810
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/lint/const_structs.checkpatch

@@ -0,0 +1,39 @@
+acpi_dock_ops
+address_space_operations
+backlight_ops
+block_device_operations
+dentry_operations
+dev_pm_ops
+dma_map_ops
+extent_io_ops
+file_lock_operations
+file_operations
+hv_ops
+ide_dma_ops
+intel_dvo_dev_ops
+item_operations
+iwl_ops
+kgdb_arch
+kgdb_io
+kset_uevent_ops
+lock_manager_operations
+microcode_ops
+mtrr_ops
+neigh_ops
+nlmsvc_binding
+of_device_id
+pci_raw_ops
+pipe_buf_operations
+platform_hibernation_ops
+platform_suspend_ops
+proto_ops
+rpc_pipe_ops
+seq_operations
+snd_ac97_build_ops
+soc_pcmcia_socket_ops
+stacktrace_ops
+sysfs_ops
+tty_operations
+uart_ops
+usb_mon_operations
+wd_ops