platform-drivers-x86 for v4.16-6

Correct a module loading race condition between the DELL_SMBIOS backend
modules and the first user by converting them to bool features of the
DELL_SMBIOS driver. Fixup the resulting Kconfig dependency issue with
DCDBAS.

The following is an automated git shortlog grouped by driver:

 -  Resolve dependency error on DCDBAS
 -  Allow for SMBIOS backend defaults
 -  Link all dell-smbios-* modules together
 -  Rename dell-smbios source to dell-smbios-base
 -  Correct some style warnings
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