i2c: qcom-cci: initialize CCI controller after registration of adapters

The change is wanted to postpone initialization of busses on CCI controller
by cci_init() and cci_reset() till adapters are registered, the later is
needed for adding I2C bus devices and get correspondent vbus regulators.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>