[Photon/P1] WiFi firmware blob compression

[avtolstoy]

submission notes

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Please Read and Sign the Contributor License Agreement ([Info here](https://github.com/spark/firmware/blob/develop/CONTRIBUTING.md)).

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Problem

We are running out of space in system-part1 on Photon and P1, where ~200K of flash space is being occupied by WiFi chip firmware.

Solution

1. Compress WiFi firmware using DEFLATE: 215172 -> 149324 (30% space savings!)
2. Decompress it in runtime: 405ms -> 485ms loading time

Resulting system-part1 size:

   text	   data	    bss	    dec	    hex	filename
 209012	    156	    288	 209456	  33230	../../../build/target/system-part1/platform-6-m/system-part1.elf

develop system-part1 size:

   text	   data	    bss	    dec	    hex	filename
 261604	    156	    276	 262036	  3ff94	../../../build/target/system-part1/platform-6-m/system-part1.elf

51K freed in system-part1.

NOTE: An intermediate release will be required to enable OTA/Ymodem upgrades to system-part1 with comperssion. Support implemented in #1420

Steps to Test

N/A

Example App

N/A

References

• [CH8759]
• spark/photon-wiced#22
• [0.7.x] KRACK WPA2 security bugfix  #1420

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Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)