Stop redefining CHIP_ERROR in Darwin headers.

[bzbarsky-apple]

That gets in the way of making it a class on Darwin.

Problem

Darwin headers redefine CHIP_ERROR, which makes it hard to turn on CHIP_CONFIG_ERROR_CLASS.

Change overview

Remove the CHIP_ERROR redefinition.

Testing

Compiled iOS CHIPTool, ran Darwin tests locally.

[github-actions]

Size increase report for "esp32-example-build" from c4fe313

File	Section	File	VM
chip-ipv6only-app.elf	.flash.text	172	172
chip-shell.elf	.flash.text	32	32

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize

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

sections,vmsize,filesize

Comparing ./master_artifact/chip-temperature-measurement-app.elf and ./pull_artifact/chip-temperature-measurement-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-ipv6only-app.elf and ./pull_artifact/chip-ipv6only-app.elf:

sections,vmsize,filesize
.flash.text,172,172
[Unmapped],0,-172

Comparing ./master_artifact/chip-persistent-storage.elf and ./pull_artifact/chip-persistent-storage.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-lock-app.elf and ./pull_artifact/chip-lock-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize
.flash.text,32,32
[Unmapped],0,-32

[bzbarsky-apple]

@mspang @LuDuda @Damian-Nordic @msandstedt @saurabhst @jepenven-silabs @jmartinez-silabs @jelderton @woody-apple Please take a look? This is one of the few things keeping us from turning on CHIP_ERROR-as-class on Darwin.