ARM: configs: aspeed: Add new drivers

This enables a handful of new drivers that have recently landed:

 - Video caputre, for doing BMC virtual keyboard-video-mouse
 - DRM driver for the BMC's own graphics device
 - Error detection and correction
 - P2A control, a BMC feature for moving data between the host and BMC
 - RTC driver

Signed-off-by: Joel Stanley <joel@jms.id.au>