[coreboot] [PATCH]even more kconfig

[Patrick Georgi]

Hi,

attached patch takes care of the UDELAY configuration in kconfig. It
also fixes:
- acpi table build on a couple of boards (introduced by one of the
earlier patches)
- build error due to missing init_timer() on amd/sc520 systems

The only difference in UDELAY configuration to newconfig is via/epia
(TSC instead of IO), but given that C3 is shown to support TSC on other
boards, I preferred more regular configurations.

Signed-off-by: Patrick Georgi