anx74xx: update usage with its CC_STATUS register
anx74xx: update usage with its CC_STATUS register

Existing get_cc function depends on set_cc function which marks a
"pull" variable to indicate if anx74xx is setting Rp or Rd. However,
if DRP auto toggle is used, this "pull" variable is unknown, but
CC_STATUS register can differentiate between SRC and SNK, so this
"pull" variable is actually not needed.

BUG=none
BRANCH=none
TEST=verify Type-C functionality did not change on Reef.

Change-Id: I6cab8d7fcee20ec6e8414b6b2591c5d975d85293
Signed-off-by: Kevin K Wong <8bf1d1ccd36a6bfde85ceaaa1fe52f2093ecf3aa@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/396428
Reviewed-by: David Hendricks <3b0deacc4b5357f519084f1ea34bd42bf5d34545@chromium.org>
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec