Add the input capture interrupt on Timer Unit instances that have it.
Add "interrupt-names" properties for clarity.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/389a18ee2cea96726462c28463cf212330f74ee3.1705325654.git.geert+renesas@glider.be