platform-drivers-x86 for v4.17-2

We missed a case in the Dell config dependencies resulting in a possible bad
configuration, resolve it by giving up on trying to keep DELL_LAPTOP visible in
the menu and make it depend on DELL_SMBIOS.

Fix a null pointer dereference at module unload for the asus-wireless driver.

The following is an automated git shortlog grouped by driver:

Kconfig:
 -  Fix dell-laptop dependency chain.

asus-wireless:
 -  Fix NULL pointer dereference
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