ARM: ep93xx: delete all boardfiles

Delete the ep93xx board files.

Signed-off-by: Nikita Shubin <[email protected]>
Tested-by: Alexander Sverdlin <[email protected]>
Acked-by: Vinod Koul <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>

Author: maquefel