[ARM] 4877/1: i.MXC family: Clean up current platform code

From: Juergen Beisert <j.beisert@pengutronix.de>

This patch cleans up the in-kernel platform code from doxygen comments.
We don't know how this could have leak in, but anyway.

Changes since last release:
 - none

Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Signed-off-by: Ross Wille <wille@freescale.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>