drm/panthor: Display FW version information

The version number output when loading the firmware is actually the
interface version not the version of the firmware itself. Update the
message to make this clearer.

However, the firmware binary has a git SHA embedded into it which can be
used to identify which firmware binary is being loaded. So output this
as a drm_info() so that it's obvious from a dmesg log which firmware
binary is being used.

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240906094025.638173-1-steven.price@arm.com