ARM: shmobile: r8a7778: Fix shmobile_init_late()

Fix r8a7778 SoC machine vector to include shmobile_init_late()
so Suspend-to-RAM and CPUIdle are setup and platform devices
are omitted as expected.

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