[Profile] Add MSP430 Low Power Constraints

[abduznik]

MSP430 is designed for ultra-low power. Code that wastes cycles is a bug on this platform.

Task

Create profiles/msp430.yaml.

Required Constraints

1. Low Power: Flag any blocking delay loops (for(;;); or __delay_cycles). Suggest entering LPM modes (LPM0, LPM3) instead.
2. ISR Speed: ISRs should be short. Flag complex math in ISRs.
3. Voltage/Speed: Warn if high frequencies (16MHz) are used without checking voltage (needs 3.3V).