accel/ivpu: Fix fw log printing

accel/ivpu: Fix fw log printing

  - Fix empty log detection that couldn't work without read_wrap_count
  - Start printing wrapped log from correct position (log_start)
  - Properly handle logs that are wrapped multiple times in reference
    to reader position
  - Don't add a newline when log buffer is wrapped
  - Always add a newline after printing a log buffer in case log does
    not end with one

Reviewed-by: Tomasz Rusinowicz <tomasz.rusinowicz@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240930195322.461209-6-jacek.lawrynowicz@linux.intel.com
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>