ARM: dts: rskrza1: Add remaining LEDs

Describe the remaining 3 LEDs, which are driven by the first CAT9554
port expander.

Drop the superfluous status property from the leds node while at it.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>