After this:
	commit b208e2f7 ("software: kernel:
	ft-debug: Update API 'debugfs_create_regset32'")

The pointer `ft->dbg_reg` was never initialized. And when we
check it for "IS_ERR_ORNULL", we get false failure.

Thus, put conditional directive for this API update.
Signed-off-by: Vaibhav Gupta <vaibhav.gupta@cern.ch>