dts: arm: ambiq: Change I2C instances to IOM instances

This commit changes the I2C instance to IOM.
IOM instance can be I2C or SPI. The choice of either
using I2C or SPI should be made in board DTS.

Signed-off-by: Mateusz Sierszulski <msierszulski@antmicro.com>
1 file changed