msp/ab2: Modified F_25MHz
msp/ab2: Modified F_25MHz

Previously, this value was simply 25000000UL. However, this will
actually result in a frequency over 25MHz. For most cases, it's ideal to
round up a multiple of 32768Hz (our typical FLL reference frequency).
Unfortunately, for 25MHz, this puts us over 25Mhz. While the device will
operate at this marginally high frequency, unpredictable behavior (like
instability in the SPI clock) will result. With this change, the default
frequency will be the maximum stable frequency.

ab2tech/msp430,ab2tech/msp430