arm64: dts: Add PL022, PL330 and SP805 DT nodes for Stingray

We have two instance of PL022 SPI controllers, one instance of
DMA PL330, and one non-secure SP805 Watchdog on Stingray SOC.

This patch adds DT nodes for the above mentioned devices in
Stingray DT.

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Reviewed-by: Pramod KUMAR <pramod.kumar@broadcom.com>
Reviewed-by: Ray Jui <rjui@broadcom.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>