[RZ_A1H]Fix bugs that I2C freq become fixed 100kHz and a static value will be indefiniteness.

Hi,

We fixed some bugs as below.

I2C:
When I2C read/write, I2C freq ignores the setting of user and it become fixed 100kHz.
Implement change the freq according to the setting of user.

gpio:
There was a function that has the potential to be called with indefiniteness argument.
Modify to not call the function with indefiniteness argument.

Regards,
Hamanaka