Enable power switch WDT on IT8587E boards

[crawfxrd]

Enable PWRSW WDT 2 and use the default timeout of 10 seconds.

Allows forcing an EC reset in case it gets into an invalid state.

Models with IT8587E:

• addw1
• darp5
• darp6
• galp3-c
• galp4
• oryp5

Ref: #315