dt-bindings: clock: Add indices for Exynos7885 TREX clocks

TREX D Core and P core clocks seem to be related to the BTS (Bus Traffic
Shaper) inside the Exynos7885 SoC, and are needed for the SoC to
function correctly.

Add indices for these clocks.

Signed-off-by: David Virag <virag.david003@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220601233743.56317-3-virag.david003@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>