Add a doc to describe build and run lighting app for i.mx 8mmevk

[FaqiangZhu-nxp]

This is a document describes how to:

• generate the Yocto SDK and the SD card image with NXP released
  Yocto source code.
• cross-compile the Linux lighting example on a host machine with
  the Yocto SDK.
• run the output executable file on i.MX 8M Mini EVK.
• run the ChipDeviceController on Raspberry Pi to communicate
  with i.MX 8M Mini EVK.

Below directory is created to hold the document:
examples/lighting-app/nxp/

NXP SoC related content like the lighting example implementation
on k32w is planned to be moved to this directory.

Signed-off-by: faqiang.zhu [email protected]

[github-actions]

Size increase report for "esp32-example-build" from 948dd7b

File	Section	File	VM
chip-bridge-app.elf	.flash.text	48	48
chip-ipv6only-app.elf	.flash.text	-172	-172
chip-temperature-measurement-app.elf	.flash.text	-60	-60
chip-shell.elf	.flash.text	-56	-56

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-persistent-storage.elf and ./pull_artifact/chip-persistent-storage.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-bridge-app.elf and ./pull_artifact/chip-bridge-app.elf:

sections,vmsize,filesize
.flash.text,48,48
[Unmapped],0,-48

Comparing ./master_artifact/chip-ipv6only-app.elf and ./pull_artifact/chip-ipv6only-app.elf:

sections,vmsize,filesize
[Unmapped],0,172
.flash.text,-172,-172

Comparing ./master_artifact/chip-temperature-measurement-app.elf and ./pull_artifact/chip-temperature-measurement-app.elf:

sections,vmsize,filesize
[Unmapped],0,60
.flash.text,-60,-60

Comparing ./master_artifact/chip-lock-app.elf and ./pull_artifact/chip-lock-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize
[Unmapped],0,56
.flash.text,-56,-56

Comparing ./master_artifact/chip-all-clusters-app.elf and ./pull_artifact/chip-all-clusters-app.elf:

sections,vmsize,filesize

[woody-apple]

@saurabhst @Damian-Nordic @msandstedt ?