sb/intel/bd82x6x: Factor out common ME functions

We can now factor out the essentially duplicated ME functions.

We include a .c file to preserve reproducibility. This is needed because
there are two different `mei_base_address` global variables, and we have
to access the same variables in order for builds to be reproducible.

The duplicate global in `me.c` and `me_8.x.c` will be completely gone
once this new `me_common.c` file becomes a standalone compilation unit.
We are wrapping some things in static inline functions, as they won't be
directly accessible anymore after moving to a separate compilation unit.

Tested with BUILD_TIMELESS=1, Asus P8Z77-V LX2 remains identical.

Change-Id: I057809aa039d70c4b5fa9c24fbd26c8f52aca736
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42012
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Michael Niewöhner

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