Fix incorrect system timer frequency

[roscopeco]

The system timer tick (driven by MFP timer C) is incorrectly running at 200Hz. It should be 100Hz.

This is because the crystal from which the timers are derived had it's frequency doubled after r0, but the bootstrap code that sets up Timer C has never been updated.

200Hz is high and has a negative (if slight) impact on system performance. Additionally, the upticks counter (which is supposed to be hundredths of a second) in FW 1.1 and 1.2 is incorrect.

This is not an issue for FW 1.01 (as it does not track upticks), but should be fixed in FW1.1 and 1.2 (and beyond).

Additionally the counter that drives the I0 flash will need to be adjusted as we want to keep the existing ~1Hz flash.