[PATCH v2 -next] drm/display: Fix build error without CONFIG_OF

[YueHaibing]

While CONFIG_OF is n but COMPILE_TEST is y, we got this:

WARNING: unmet direct dependencies detected for DRM_DP_AUX_BUS
  Depends on [n]: HAS_IOMEM [=y] && DRM [=y] && OF [=n]
  Selected by [y]:
  - DRM_MSM [=y] && HAS_IOMEM [=y] && DRM [=y] && (ARCH_QCOM || SOC_IMX5 || COMPILE_TEST [=y]) && COMMON_CLK [=y] && IOMMU_SUPPORT [=y] && (QCOM_OCMEM [=n] || QCOM_OCMEM [=n]=n) && (QCOM_LLCC [=y] || QCOM_LLCC [=y]=n) && (QCOM_COMMAND_DB [=n] || QCOM_COMMAND_DB [=n]=n)

Make DRM_DP_AUX_BUS depends on OF || COMPILE_TEST to fix this warning.

Fixes: f5d01644921b ("drm/msm: select DRM_DP_AUX_BUS for the AUX bus support")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
v2: fix this in DRM_DP_AUX_BUS dependencies
---
 drivers/gpu/drm/display/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/display/Kconfig b/drivers/gpu/drm/display/Kconfig
index 1b6e6af37546..09712b88a5b8 100644
--- a/drivers/gpu/drm/display/Kconfig
+++ b/drivers/gpu/drm/display/Kconfig
@@ -3,7 +3,7 @@
 config DRM_DP_AUX_BUS
 	tristate
 	depends on DRM
-	depends on OF
+	depends on OF || COMPILE_TEST
 
 config DRM_DISPLAY_HELPER
 	tristate
-- 
2.17.1