Add some more devices to the MPC85XX-based configs

These devices bring the configs closer to a desktop-like (GENERIC) kernel
config.

• The Freescale DIU support was added to the config in r306358. Without keyboard support video support is nearly pointless, so add ukbd and ums.
• The AmigaOne X5000, and P1022 devboard, both use a variant of the ds1307 RTC
• cpufreq scaling is currently supported by the p1022. More SoCs will be added eventually.