[ESP32] decouple Thread support from specific chip model

[gjc13]

Problem

The Thread support on ESP32 series is now bound to a specific chip model. We'd also like to support Thread provisioning for an ESP32 connected with an RCP.

Change overview

This change makes OpenThread available on all ESP32 series when CONFIG_OPENTHREAD_ENABLED is on.

Testing

How was this tested? (at least one bullet point required)

• Build all-cluster-app and use chip-dev-ctrl to provision the WiFi and the Thread network.

[github-actions]

Size increase report for "esp32-example-build" from e4d15a8

File	Section	File	VM
chip-all-clusters-app.elf	.flash.text	-32	-32

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

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

sections,vmsize,filesize
.debug_info,0,84431
.debug_line,0,5993
.debug_abbrev,0,4560
.strtab,0,828
.debug_loc,0,193
.symtab,0,112
.debug_ranges,0,64
.debug_aranges,0,32
[Unmapped],0,32
.riscv.attributes,0,2
.debug_frame,0,-4
.flash.text,-32,-32
.debug_str,0,-1515

[woody-apple]

@saurabhst @andy31415 @Damian-Nordic ?