ARM: shmobile: armadillo800eva: remove left-overs

A comment and a #define in board-armadillo800eva.c have been left over
after recent changes and are no longer relevant or needed, remove them.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>