ENGR00267024 mx6q: Stop DMA memory fragmentation

Applied patch from customer to prevent DMA memory
fragmentation. Customer reported system crashes due to running out of
DMA-able memory while playing videos. Reported in CT42391649.

Signed-off-by: Jay Monkman <jay.monkman@freescale.com>

Conflicts:

	arch/arm/mach-mx6/board-mx6q_sabrelite.c
	arch/arm/mach-mx6/board-mx6q_sabresd.c
ENGR00271344L Fix for ENGR00267024 introduced compilation warning

Fixed code so condition causing the warning never occurs.

Signed-off-by: Jay Monkman <jay.monkman@freescale.com>