dpll: zl3073x: Fix output pin registration

dpll: zl3073x: Fix output pin registration

Currently, the signal format of an associated output is not considered
during output pin registration. As a result, the driver registers output
pins that are disabled by the signal format configuration.

Fix this by calling zl3073x_output_pin_is_enabled() to check whether
a given output pin should be registered or not.

Fixes: 75a71ecc2412 ("dpll: zl3073x: Register DPLL devices and pins")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Link: https://patch.msgid.link/20251027140912.233152-1-ivecera@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>