pvr: drop 'Imagination' from deviceName

This is to align the device naming with the closed source driver.

Signed-off-by: Frank Binns <frank.binns@imgtec.com>
Acked-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31679>

src/imagination/vulkan/pvr_device.c

@@ -615,7 +615,7 @@ static bool pvr_physical_device_get_properties(
 
    snprintf(properties->deviceName,
             sizeof(properties->deviceName),
-            "Imagination PowerVR %s %s",
+            "PowerVR %s %s",
             dev_info->ident.series_name,
             dev_info->ident.public_name);