ARM: shmobile: Make EMEV2 setup functions static

Adjust emev2_init_delay() and emev2_add_standard_devices_dt()
to become static. They are not used outside this file anyway.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>