ARM: dts: sti: remove delta node from stih410.dtsi

The delta0 node within stih410.dtsi is identical to the
one already written within stih407-family.dtsi and included
within stih410.dtsi.

Signed-off-by: Alain Volmat <avolmat@me.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>