armv7: fix a bad variable assignment

'<' was used when '<<' is needed. Oops!

Change-Id: I8451f76888e86219df16b50739cd2c8db80dcb14
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/2941
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Tested-by: build bot (Jenkins)

src/arch/armv7/lib/cache.c

@@ -264,7 +264,7 @@ void armv7_invalidate_caches(void)
 			write_csselr(csselr);
 			icache_invalidate_all();
 
-			csselr = level < 1;
+			csselr = level << 1;
 			write_csselr(csselr);
 			dcache_invalidate_all();
 			break;