rpr0521: report I2C errors, clean up transfer calls am: 71b6e4d0f3 am: c09a457918 am: 9dd9b0fe2a am: e722ea5e1f

Original change: https://android-review.googlesource.com/c/device/google/contexthub/+/1328934

Change-Id: Ibf402c3d76db3b64822a14e7e3c9333667fb6828