lenovo/T520: Remove butterfly DSP init.

It's specific to butterfly. Doesn't do anything on lenovos.

Change-Id: I98b7c3199de5d8515bd869936e1b95847321d264
Signed-off-by: Nicolas Reinecke <nr@das-labor.org>
Reviewed-on: http://review.coreboot.org/7099
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)
1 file changed