ARM: ux500: Remove PrimeCell IDs from Nomadik I2C DT nodes

Turns out that they're actually not required and the driver probes just
fine without them. The ID is incorrect at the moment anyway. They actually
currently specify the stn8815.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>