Add WDT and timer implementations

Rename frequency and make optional

* Updates to include SPI and SPIXIP params in OBJ Description

Fix deprecation warnings

* fixing timer reg prefix issue

* Keeping back the default value for peripherals

* DTS clocks added to peripherals: GPIO, PWM, SPI, SPIXIP, UART

* Counter --> Timer

* fixed reg prefix issue

GPIO: Add a  Tie-Off Method which includes IOF pins

Use parenthesis to make the side effects more obvious

Add GPIO object model

Addition of Peripherals OM for the SCD

Fix imports for Chisel 3.2

update wit and wake files