Spring clean/refactor of NPU driver

These changes mostly focus on creating a better structure
for the driver. Creating a better separation between driver
and device(s).

A short summary of what this commit contains:

    - Move driver specific defines from device to driver
    - Prefix device functions with ethosu_dev
    - Remove device specific register access' from driver
    - Remove device specific debug/dump functions
    - Add function prototypes for weak functions
    - Remove legacy ARM_NPU_STUB support
    - Rename ethosu_device.c to ethosu_device_u55.c
    - Remove redundant irq handler prototype
    - Remove (deprecated) hardcoded instance ethosu_drv

    - Simplify versioning API
      Split driver version and hardware version/information so
      that driver version can be queried without a driver instance.

    - Improve and simplify logging
      Make warning the new default severity level to print and
      reduce severity levels to:
        err
        warning
        info
        debug

    - Add severity prefix to log lines. Error messages print file
      and line number, debug messages print function by default.
    - Clarify some log messages

    - Small optimizations and bugfixes

Change-Id: I2dfbfc3a40d7eca133c82f187f422325e1e6d314

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