platform-drivers-x86 for v4.18-1

Several incremental improvements including new keycodes, new models, new
quirks, and related documentation. Adds LED platform driver activation
for Mellanox systems.  Some minor optimizations and cleanups. Includes
several bug fixes, message silencing, mostly minor.

The following commits were previously merged during the 4.17 RC cycle:
 - 06b8b00b33 platform/x86: asus-wireless: Fix NULL pointer dereference
 - 6ed66c3ce0 platform/x86: Kconfig: Fix dell-laptop dependency chain.
 - 74783c99bf platform/x86: DELL_WMI use depends on instead of select for DELL_SMBIOS
 - cf48bf9eee platform/x86: asus-wmi: Fix NULL pointer dereference

The following is an automated git shortlog grouped by driver:

acer-wmi:
 -  add another KEY_POWER keycode

apple-gmux:
 -  fix gmux_get_client_id()'s return type

asus-laptop:
 -  Simplify getting .drvdata

asus-wireless:
 -  Fix format specifier

dell-laptop:
 -  Fix keyboard backlight timeout on XPS 13 9370

dell-smbios:
 -  Match on www.dell.com in OEM strings too

dell-wmi:
 -  Ignore new rfkill and fn-lock events
 -  Set correct keycode for Fn + left arrow

fujitsu-laptop:
 -  Simplify soft key handling

ideapad-laptop:
 -  Add E42-80 to no_hw_rfkill
 -  Add fn-lock setting
 -  Add MIIX 720-12IKB to no_hw_rfkill

lib/string_helpers:
 -  Add missed declaration of struct task_struct

intel_scu_ipc:
 -  Replace mdelay with usleep_range in intel_scu_ipc_i2c_cntrl

mlx-platform:
 -  Add LED platform driver activation

platform/mellanox:
 -  Add new ODM system types to mlx-platform
 -  mlxreg-hotplug: add extra cycle for hotplug work queue
 -  mlxreg-hotplug: Document fixes for hotplug private data

platform_data/mlxreg:
 -  Document fixes for hotplug device

silead_dmi:
 -  Add entry for Chuwi Hi8 tablet touchscreen
 -  Add touchscreen info for the Onda V891w tablet
 -  Add info for the PoV mobii TAB-P800W (v2.0)
 -  Add touchscreen info for the Jumper EZpad 6 Pro

thinkpad_acpi:
 -  silence false-positive-prone pr_warn
 -  do not report thermal sensor state for tablet mode switch
 -  silence HKEY 0x6032, 0x60f0, 0x6030
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