imx21: activate i2c
Set the correct clkdev-name for the i2c clock.
It also get's rid of the ARCH_NR_GPIOS define on the rationale
that isn't an ARCH-wide setting anyway. If a device has two
pca953x devices, the reserved number will be wrong.
Signed-off-by: NHolger Schurig <hs4233@mail.mn-solutions.de>
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