Don't limit architectures

[jpm-canonical]

Is there a reason for limiting this snap to these two architectures?

chip-tool-snap/snap/snapcraft.yaml

Lines 12 to 14 in 84a4fa4

	architectures:
	- build-on: amd64
	- build-on: arm64

Same question for all-clusters:
https://github.com/canonical/matter-all-clusters-app-snap/blob/466d505b1ded346fbbe9f1b0a4d067b8d837e5e9/snap/snapcraft.yaml#L14-L16