drm/imagination: move update_logtype() into ifdef section

This function is only used when debugfs is enabled, and otherwise
causes a build warning:

drivers/gpu/drm/imagination/pvr_fw_trace.c:135:1: error: 'update_logtype' defined but not used [-Werror=unused-function]

Move the #ifdef check to include this function as well.

Fixes: cb56cd6 ("drm/imagination: Add firmware trace to debugfs")
Acked-by: Frank Binns <frank.binns@imgtec.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20231204073231.1164163-1-arnd@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>

Author: arndb

drivers/gpu/drm/imagination/pvr_fw_trace.c

@@ -121,6 +121,8 @@ void pvr_fw_trace_fini(struct pvr_device *pvr_dev)
 	pvr_fw_object_unmap_and_destroy(fw_trace->tracebuf_ctrl_obj);
 }
 
+#if defined(CONFIG_DEBUG_FS)
+
 /**
  * update_logtype() - Send KCCB command to trigger FW to update logtype
  * @pvr_dev: Target PowerVR device
@@ -165,8 +167,6 @@ update_logtype(struct pvr_device *pvr_dev, u32 group_mask)
 	return err;
 }
 
-#if defined(CONFIG_DEBUG_FS)
-
 struct pvr_fw_trace_seq_data {
 	/** @buffer: Pointer to copy of trace data. */
 	u32 *buffer;