ARM: configs: qcom_defconfig: Reduce CMA size to 64MB

Not all platforms are able to allocate CMA size of 256MB. One such
platform is SDX55. Hence, use the standard 64MB size for CMA.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20210408170930.91834-8-manivannan.sadhasivam@linaro.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm/configs/qcom_defconfig

@@ -296,7 +296,7 @@ CONFIG_NLS_ASCII=y
 CONFIG_NLS_ISO8859_1=y
 CONFIG_NLS_UTF8=y
 CONFIG_DMA_CMA=y
-CONFIG_CMA_SIZE_MBYTES=256
+CONFIG_CMA_SIZE_MBYTES=64
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y
 CONFIG_DEBUG_INFO=y