dt-bindings: mfd: samsung,exynos5433-lpass: Fix 'dma-channels/requests' properties

pl330 DMA controller bindings documented 'dma-channels' and
'dma-requests' properties (without leading hash sign), so fix the DTS to
match the bindings.

Fixes: e18183ce ("mfd: Add DT bindings documentation for Samsung Exynos LPASS")
Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220427155840.596535-7-krzysztof.kozlowski@linaro.org