It's usually only called from init() in main.c, so this is safe.
There is one more call in system-dm320.c from system_init(), but
that's also "safe". I don't know if it's okay to call i2c_init()
twice, but presumably it works...
Change-Id: I9c1cd918d162d9955f7cf03209e836cbd5e30c57
Atmel AT88SC6416C CryptoMemory is almost I2C compatible. The device
is connected to bitbanged I2C bus shared with compliant I2C devices.
Change-Id: Iec54702db1bdfb93c01291eef18ec60391c63b16
