My Bad!
There was a typo in my previous comment: Can you try below commands instead.
$ sudo zcat /proc/config.gz | grep AIC32
$ sudo cat /sys/kernel/debug/tegra_pinctrl_reg | grep i2c
[Also, I assume you do have a backup of tegra186-mb1-bct-pinmux-quill-p3310-1000-c03.cfg that was included in the BSP.]