mei: Do not attempt to parse HFSTS6 when using TXT
mei: Do not attempt to parse HFSTS6 when using TXT

It seems the MEI parameters are not set for platforms such as Apollo Lake.
The only bit set was FPF_SOC_LOCK, with the others all cleared to zero.

Fixes https://github.com/fwupd/fwupd/issues/2335 for a peculiar definition of 'fix'.

hughsie/fwupd,fwupd/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,fwupd/fwupd,fwupd/fwupd