linux-phytec-fsl

IMX7FLY-274 ARM: dts: imx7s-pcm-061-0502100e: reduce the size of CMA

Due to performance issues with the 4.9 kernel upgrade, less memory
has been allocated to CMA so that more is available for the rest of
the system.

Signed-off-by: Anna Horstmann <ahorstmann@phytec.com>