ARM: renesas: Add generic timer initialization for V3U Falcon

Init the Generic Timer for V3U Falcon in early phase

Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>