i2c: mxc: Make 'no gpio pinctrl state' print as debug

i2c: mxc: Make 'no gpio pinctrl state' print as debug

Some I2C bus devicetree nodes, doesn't require to have
gpio pinctrl so replace the dev_info to debug so the
print never comes on the console and for bus that uses
gpio pinctrl anyway have dev_err.

Before:
------
U-Boot> i2c dev 1
Setting bus to 1
i2c bus 1 at 0x21a4000, no gpio pinctrl state.

After:
------
U-Boot> i2c dev 1
Setting bus to 1

Cc: Simon Glass <[email protected]>
Cc: Heiko Schocher <[email protected]>
Cc: Peng Fan <[email protected]>
Cc: Michael Trimarchi <[email protected]>
Signed-off-by: Jagan Teki <[email protected]>
Acked-by: Heiko Schocher <[email protected]>