clk: ti: omap5: Add proper parent clocks for l4-secure clocks

L4 secure clocks do not have their parents set currently, which ends
them up to the orphan clock list. Fix this by adding either l3 or l4
clock as their parent.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Link: https://lkml.kernel.org/r/20200429131341.4697-4-t-kristo@ti.com


Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>