ARM: shmobile: r8a7778: Switch to new style TMU device

ARM: shmobile: r8a7778: Switch to new style TMU device

The TMU (Timer Unit) driver implements a new style of platform data that
handles the timer as a single device with multiple channel. Switch from
the old-style platform data to the new-style platform data.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit 535ef0d9575b0809915341481ef3bac6bb5d0aaa)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>