2.2.0

Corelibs
-Update core version to 2.2
-Update rtos version to 1.8
-Move CuriePowerManagement library in to cores
-Use IPM for cdc-acm transfer between arc and X86 cores
-Change SRAM mapping and increase SRAM allocated to ARC core to 40K
-Add error functions that allow halting of the ARC core and toggle the fault led
-minor bug fixes

Firmware
-Firmware is now based on Zephyr 1.8
-Blink TX/RX led during cdc-acm transfers
-USB descriptors are now read from the OTP area
-Use IPM for cdc-acm transfer between arc and X86 cores
-Fault led can now be accessed by error functions in the core-libs
-Add firmware version string