arm64: dts: exynos: move aliases to board in Exynos850

The aliases for typical blocks which are disabled by default in DTSI
(like I2C, UART and MMC) should be defined in the board DTS.  The board
should add aliases only for enabled blocks according to its specific
order.

On Exynos850, move aliases of enabled blocks to E850-96 board and remove
unused ones.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220221075219.10827-1-krzysztof.kozlowski@canonical.com