[coreboot] support for w83977ef in coreboot-v2

[Andriy Gapon]

Add (basic) support for W83977EF Super-IO chip.
This is based on w83977tf code and on earlier support for this chip in 
superiotool.

Signed-off-by: Andriy Gapon <avg at icyb.net.ua>

---
This was done by copy'n'paste of w83977tf, substitution of w83977tf with 
w83977ef, and then some chip-specific changes in the list of logical 
devices in w83977tf.h and their resources in superio.c:pnp_dev_info.

The code was not tested yet on real hardware (and there is no mobo in 
the src to use it yet), but I believe that it should work - based on 
triviality of the changes and hardware specs.

As my changes were fairly minimal I left all copyrights as they were in 
w83977tf code.

-- 
Andriy Gapon
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