ARM: dts: ti: Drop usage of ti,am33xx-ecap from DT nodes

ti,am33xx-ecap is used to represent device nodes using ti,hwmod data.
Now that hwmod entries are entirely removed, drop usage of
ti,am33xx-ecap compatible from all DT nodes.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>