Migrate from Gecko SDK 4.4.4 to Simplicity SDK 2024.6.2

[puddly]

I think most of the issues have been ironed out in the 2024.6.2 release of the Simplicity SDK.

This PR upgrades OpenThread, Zigbee, and the Gecko Bootloader templates.

[Nerivec]

Some extra stuff for create_gbl.py (also the file for cpc_version changed):
main...Nerivec:silabs-firmware-builder:improved-versions-retrieval

Produces a cleaner output with ot_version than current ot_rcp_version in my opinion (better filenames, no need for processing in yaml):

{"baudrate":460800,"fw_type":"openthread_rcp","fw_variant":"no_flow","metadata_version":2,"ot_rcp_version":"SL-OPENTHREAD/2.5.2.0_GitHub-1fceb225b","sdk_version":"2024.6.2"}

{"baudrate":460800,"fw_type":"openthread_rcp","fw_variant":"no_flow","metadata_version":2,"ot_version":"2.5.2.0","sdk_version":"2024.6.2"}

Also more in line with ezsp_version meta:

{"baudrate":115200,"ezsp_version":"8.0.2.0","fw_type":"zigbee_ncp","fw_variant":"sw_flow","metadata_version":2,"sdk_version":"2024.6.2"}

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Some actions in build.yaml are outdated.
#87

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Worth mentioning, some configs require to be set through slcp_defines to actually be applied:

slcp_defines:
  SL_ZIGBEE_ADDRESS_TABLE_SIZE: 32
  SL_ZIGBEE_MULTICAST_TABLE_SIZE: 26
  SL_ZIGBEE_ROUTE_TABLE_SIZE: 16
  SL_ZIGBEE_DISCOVERY_TABLE_SIZE: 8

FIY - SDK defaults:

ADDRESS_TABLE_SIZE = 8
MULTICAST_TABLE_SIZE = 8
ROUTE_TABLE_SIZE = 16
DISCOVERY_TABLE_SIZE = 8

[puddly]

Regarding the OpenThread version: the commit ID sometimes changes (and sometimes does not) even while the version stays static. I think this is also the version string returned by the Spinel protocol, in line with the others.

[Hedda]

Will it still be possible to build EmberZNet 7.x.x Zigbee firmware images once have migrated from Gecko SDK to Simplicity SDK?

Thinking it might in some use cases still be nice to be able to make legacy builds for newer EmberZNet 7.x.x Zigbee firmware?

Nerivec mentioned that his forked silabs-firmware-builder just support the new SDK so it can only build EmberZNet 8.x.x images.

[puddly]

There are no plans right now to fully migrate, the firmwares are still not stable.