ARM: dts: i.MX35: Fix can support.

Since commit 3d42a379
("can: flexcan: add 2nd clock to support imx53 and newer")
the can driver requires a dt nodes to have a second clock.
Add them to imx35 to fix probing the flex can driver on the
respective platforms.

Signed-off-by: Denis Carikli <denis@eukrea.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>