ARM: 7192/1: OMAP: Fix build error for omap1_defconfig

Otherwise we get the following error:

In function 'omap_init_consistent_dma_size':
error: implicit declaration of function 'init_consistent_dma_size'

Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>