Make it possible to fallback to GPIO for I2C1 on the EXIO-C connector.

This is based on reference work for the I2C0 core of the lager/r8a7790
by Wolfram Sang.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>
[wsa: rebased and fixed aliases]
Signed-off-by: NWolfram Sang <wsa+renesas@sang-engineering.com>