There are two patches that probe the ICH problem on the Thinkpad to
see if we can avoid introducing the extra delays required for all AC97
H/W.  The patches are alternate approaches and should be applied
independently.

Patch 1: ich.c.patch

Reads the global status register and checks the primary (and secondary
if present) bits that may (or may not) map to the codec ready bit in
the AC-link protocol frame (SDATA_OUT).  There is not enough
information in the ICH docs to be certain of this.  If the mapping is
correct, this is definitely the right modification.

Patch 2: ac97.patch
      
Spin on status bits in AC97 power register - ie everything is up
following reset. (only ac97_initmixer for time being).