arm64: dts: exynos: Add Bluetooth chip to TM2(e) boards

TM2(e) boards have a Broadcom Bluetooth chip connected to 3rd UART port.
Add a device tree node describing it and its resources (control GPIO lines
and clock).

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>