Fixes monolithic builds

[avtolstoy]

Problem

Fixes monolithic builds on:

• Electron (mainly broken by Move cellular HAL to system-part3 #1184) Fixes #1339
• Photon (broken in feature/photon/wiced-3.7.0-7 branch due to WICED upgrade and an oversight)

Solution

• Use tls function callbacks on Photon/P1 only with modular builds
• Use cellular HAL NET callbacks on Electron only in modular builds
• Change preprocessor #if MODULAR_FIRMWARE checks to #if defined(MODULAR_FIRMWARE) && MODULAR_FIRMWARE, to avoid triggering an error with -Wundef which is now always enabled
• Link HAL with Lib_crypto_open.a on Photon/P1 in monolithic builds
• Weaken sha4 functions in Lib_crypto_open.a
• Restore monolithic WICED linker files which were lost during an upgrade to WICED 3.7.0-7

Steps to Test

Build Photon and Electron firmware in modular and monolithic.

Example App

N/A

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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)

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Bug fix

• [PR #1340] [Electron] Fixes the monolithic build

[sergeuz]

Tested modular and non-modular builds on Photon and Electron, both devices connect to the cloud normally 👍