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The DECON headers contain only defines for registers.  There are no
other drivers using them so this should be put locally to the Exynos DRM
driver.  Keeping headers local helps managing the code.
Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>