V3.1.x units compile guide


cmake -DCMAKE_BUILD_TYPE=debug -DISP_VERSION=ISP8000NANO_V1802 -DPLATFORM=X86 -DAPPMODE=NATIVE -DQTLESS=0 -DFULL_SRC_COMPILE=1 -DSERVER_LESS=0 ..

Options:
* CMAKE_BUILD_TYPE: release or debug
* ISP_VERSION: aligned with ISP project configurations.
	ISP Version Details refer to release note.
* PLATFORM:
	ARM64
	ARMV7
	X86
* APPMODE:
	V4L2
	NATIVE
	MEDIACONTROL  (future support)
* QTLESS:
	0: with QT environment
	1: without QT environment
* FULL_SRC_COMPILE:
	1: full source compile with driver, media controller
	0: lib compile with driver and media controller
* SERVER_LESS:
	0: with tuning server compile
	1: without tuning server compile

