m28evk: Fix comment about the number of RAM banks

m28evk has one bank of RAM.

Fix the comment.

Cc: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Marek Vasut <marek.vasut@gmail.com>
1 file changed