Fix sample littlevgl/gui build issues on zephyr platform #588
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Fix sample littlevgl/guil build issues on zephyr platform, modify code of zephyr platform by adding some macros to control some apis to fit different zephyr version, and align to zephyr-v2.3.0 for sample littlevgl/gui as the latest zephyr version (>=v2.4.0) requires that the thread stack for the thread to create must be defined by macro but not allocating stack memory dynamically.
Signed-off-by: Wenyong Huang wenyong.huang@intel.com