[gen3][esomx] Define E404X platform

[scott-brust]

Problem

E404X Hardware needs to be supported in DVOS

Solution

Add new PLATFORM_ID for esomx platform, largely based off of boron module/platform definitions

Steps to Test

Build using new platform and test with boron hardware:

make PLATFORM=esomx APP=tinker clean all

Example App

Use tinker

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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)

[XuGuohui]

I think the following files need to be modified as well:

1. platform/MCU/nRF52840/src/hw_config.c, line 197
2. user/applications/tinker/application.cpp
3. user/tests/wiring/no_fixture_long_running/network.cpp, pwm.cpp
4. user/tests/wiring/spi_master_slave

[scott-brust]

I think the following files need to be modified as well:

1. platform/MCU/nRF52840/src/hw_config.c, line 197
2. user/applications/tinker/application.cpp
3. user/tests/wiring/no_fixture_long_running/network.cpp, pwm.cpp
4. user/tests/wiring/spi_master_slave

I'm working on pinmap next and will update tinker and tests then

[artyLee]

If there is using 8M flash, need to change macro #define HAL_PLATFORM_FLASH_MX25L3233F (1) to #define HAL_PLATFORM_FLASH_MX25R6435FZNIL0 (1)