gateware: add R3.3 touch sensing support #54
Merged
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clean up the following changes and bring to master:
example build:
make BOARD=icebreaker CORE=touch_cv HW_REV=HW_R33 TOUCH=TOUCH_SENSE_ENABLED prog
users should build with
TOUCH=TOUCH_SENSE_ENABLED
otherwise the interface will wire all touch sense lines to zero