ARM: dts: rmobile: Reinstate missing i2c6 on Porter

The I2C6 is used to communicate with the PMIC and it was removed
during DT sync with Linux 4.17. Reinstate it.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
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