[PATCH v2] drm/bridge: Fix 0-day build error

[Fabrizio Castro]

kbuild test robot reports:

>> ERROR: "i2c_mux_add_adapter" [drivers/gpu/drm/bridge/sii902x.ko]
undefined!
>> ERROR: "i2c_mux_alloc" [drivers/gpu/drm/bridge/sii902x.ko]
undefined!
>> ERROR: "i2c_mux_del_adapters" [drivers/gpu/drm/bridge/sii902x.ko]
undefined!

Quite obviously the driver depends on I2C_MUX, but adding a "depends on"
introduces a recursive dependency, therefore this patch selects I2C_MUX
instead.

Fixes: 21d808405fe4 ("drm/bridge/sii902x: Fix EDID readback")
Signed-off-by: Fabrizio Castro <fabrizio.castro at bp.renesas.com>
Link: https://lists.01.org/pipermail/kbuild-all/2018-November/054924.html
---
v1->v2:
* Added "Fixes" tag

 drivers/gpu/drm/bridge/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 9eeb8ef..2fee47b 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -95,6 +95,7 @@ config DRM_SII902X
 	depends on OF
 	select DRM_KMS_HELPER
 	select REGMAP_I2C
+	select I2C_MUX
 	---help---
 	  Silicon Image sii902x bridge chip driver.
 
-- 
2.7.4