firmware: include drivers/firmware/Kconfig unconditionally

Compile-testing drivers that require access to a firmware layer
fails when that firmware symbol is unavailable. This happened
twice this week:

 - My proposed to change to rework the QCOM_SCM firmware symbol
   broke on ppc64 and others.

 - The cs_dsp firmware patch added device specific firmware loader
   into drivers/firmware, which broke on the same set of
   architectures.

We should probably do the same thing for other subsystems as well,
but fix this one first as this is a dependency for other patches
getting merged.

Reviewed-by: Bjorn Andersson <[email protected]>
Reviewed-by: Charles Keepax <[email protected]>
Acked-by: Will Deacon <[email protected]>
Acked-by: Bjorn Andersson <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Liam Girdwood <[email protected]>
Cc: Charles Keepax <[email protected]>
Cc: Simon Trimmer <[email protected]>
Cc: Michael Ellerman <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

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