ARM: DTS: da850: add node for i2c1

da850 has two I2C controllers, but the node for i2c1 was missing.
Add node for i2c1 controller and i2c1 pinmux pins.

Signed-off-by: Petr Kulhavy <petr@barix.com>
[nsekhar@ti.com: fix indentation]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>