Use left bit-shift rather then a magic value for SMP mode

Most other chips and boards use a bitshift rather then a fixed value.
For consistency sake we should do the same

Signed-off-by: Olliver Schinagl <olliver@schinagl.nl>
Make mmc header comments consistent with the rest

This small patch makes the comments in the mmc driver consistent with
the rest. As reference clock.h was used.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
Use define for i2c base address

For some reason, i2c was using a hardcoded base address for the
register. Use a pre-existing define instead.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>