ARM: imx_v6_v7_defconfig: Increase CMA size

Increase the CMA size to 64 MiB, otherwise it isn't possible to use
etnaviv driver on systems with 1920x1080 panel due to insufficient
memory .

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
index 8ec4dbb..8e66e22 100644
--- a/arch/arm/configs/imx_v6_v7_defconfig
+++ b/arch/arm/configs/imx_v6_v7_defconfig
@@ -86,6 +86,7 @@
 CONFIG_DEVTMPFS_MOUNT=y
 # CONFIG_STANDALONE is not set
 CONFIG_DMA_CMA=y
+CONFIG_CMA_SIZE_MBYTES=64
 CONFIG_IMX_WEIM=y
 CONFIG_CONNECTOR=y
 CONFIG_MTD=y