omap3: Fix compile for board-cm-t35

Otherwise we can get the following error:

error: variable 'tdo24m_mcspi_config' has initializer but incomplete type
...
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/board-cm-t35.c

@@ -45,6 +45,7 @@
 #include <plat/gpmc.h>
 #include <plat/usb.h>
 #include <plat/display.h>
+#include <plat/mcspi.h>
 
 #include <mach/hardware.h>