Dynamically generate probe-methods and baudrates

[tl-sl]

Generate probe methods and baudrates based on values with defined baudrates in manifest. This allows to only probe a subset of supported application types effectively allowing for optional apps.

For example I might define:

	"baudrates": {
		"bootloader": [115200],
		"ezsp": [115200],
		"spinel": [460800],
                "router": [115200],
	},

Too skip probing CPC, but also probe router which could be an optional app type.