This patch adds Rev C5 support for a new memory chip that was added to
the Beagleboard Revision C5. The chip is 256MB SDRAM and the following
patch enables it.

The micron memory chip part is: MT29C4G48MAZAPAKQ-5 IT.

I have tested my patch and it works fine but before I submit it, I
will be grateful if I can get some review feedback (specially with the
details of timing and AC parameter values). Thanks

Signed-off-by: Joel A Fernandes <joelagnel@ti.com>

Is it just me or did something mangle tabs to spaces in this patch?