Create package:lib-tflite

[psyhtest]

We've accumulated a number of packages building TFLite from source e.g. package:lib-tflite-1.15.0-src-static. We should create a single package:lib-tflite-src-static (or simply package:lib-tflite) to keep versioning and patching in one place via the mechanism of variations.

The package:lib-armnn package provides good working examples of:

• source tag and version control;
• generic and revision-specific patching;
• target-specific augmentation (e.g. need to pass EXTRA_CXXFLAGS="-march=armv7-a+neon+vfpv4 -mfpu=neon-vfpv4" when building on Raspberry Pi 4).

The immediate versions of interest are 1.15.3, 1.13.2, and 2.0.2.

The goal is to be able to install TFLite from the new package e.g. as follows:

$ ck install package --tags=lib,tflite,v2.0.2
$ ck install package --tags=lib,tflite,v1.15.3,rpi4

[psyhtest]

Thanks for your contributions @slahiruk - marking as complete.