Tweak loglevel for dmidecode warning

In 18056a3 I changed the loglevel to WARNING, in my brain that was the
next *less* verbose loglevel, when in reality this should have been
changed to DEBUG.

Since the change, now all salt CLI commands show this warning since the
default CLI loglevel is warning. This is obviously not what I intended.

Also, this changes the warning about lspci to loglevel DEBUG.
Merge pull request #12310 from terminalmage/quickfix

Tweak loglevel for dmidecode warning