Increase clock speed
Increase clock speed

- increased system and peripheral clock speeds and reconfigured clock
sources
- UART can handle up to 2Mbaud throughput (previously had issues even at
1Mbaud)
- flashing speed of the Nest Thermostat increased from 48kB/s to 71kB/s. Both the system clock
and peripheral clock speed had to be increased

Issue: b/197720622   b/199818558
Change-Id: I1019e9978c00041f44987176f0b55fd02689c6d7

google/DAPLink-port,google/DAPLink-port,google/DAPLink-port,google/DAPLink-port