[U-Boot] CONFIG_DISPLAY causes build error on microblaze-generic

[Anatolij Gustschin]

Hi Bin,

> Hi Simon, Anatolij,
> 
> At present CONFIG_DISPLAY is set to y by default when driver model is
> on. This causes the following building error on microblaze-generic.
> 
>   drivers/built-in.o: In function 'display_read_timing':
>   drivers/video/display-uclass.c:45: undefined reference to 'edid_get_timing'
>
> I think we should make CONFIG_DISPLAY 'default n' and update whatever
> boards who want DM video support to explicitly turn in on in its board
> defconfig files. This will fix microblaze-generic build error too.

CONFIG_DISPLAY depends on CONFIG_I2C_EDID, this should be considered
in Kconfig, too.

--
Anatolij