ARM: shmobile: Use DT for GIC on EMEV2 and KZM9D

Remove the C version of the EMEV2 GIC setup code,
instead rely on GIC information provided by DT.

Signed-off-by: Magnus Damm <damm@opensource.se>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>