ARM: dts: am335x-icev2: Add DT node for TI PCA9536

AM335x ICE board has a TI PCA9536 chip connected to I2C0 at address
0x41. Add DT entry for the same.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Acked-by: Kristofer Martinez <Kristofer.S.Martinez@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>