accel/ivpu: Limit FW version string length

Limit FW version string, when parsing FW binary, to 256 bytes and
always add NULL-terminate it.

Reviewed-by: Karol Wachowski <karol.wachowski@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240930195322.461209-7-jacek.lawrynowicz@linux.intel.com


Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>