ARM: shmobile: armadillo800eva legacy: Add missing A4S pm domain devices

Commit 8459293c ("ARM: shmobile: r8a7740: add A4S pm domain
support") added the A4S power domain, but forgot to hook up the GbEther
hardware block.

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