board: imx53: fix l2 cache initialization

board: imx53: fix l2 cache initialization

Both http://openocd.zylin.com/542/ and http://openocd.zylin.com/543/
introduce the same typo in the bitfield for initializing the l2
cache of imx53.
One year later, http://openocd.zylin.com/1461/ copy-pastes the same
typo.
The comment above the code show that it's really an error and not
the expected behaviour.

Fix the typo replacing the incorrect comparison '<' with a left
shift.

Change-Id: I43725731a2228e28a676215f76936fa289d9395e
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Fixes: e3b327343394 ("cfg: add imx53loco board config")
Fixes: 108a458ab888 ("cfg: add icnova_imx53_sodimm board config")
Fixes: e608ced33001 ("ftdi/board: Add support for DENX M53EVK")
Reviewed-on: http://openocd.zylin.com/6156
Tested-by: jenkins
Reviewed-by: Adrian M Negreanu <adrian.negreanu@nxp.com>
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>