arm: dts: Add dsi pll1 base address along with dsi pll 0

DSI-1 PLL needs to be manually shutdown even if it's unused. We need to
write to the DSI1 PLL register space while configuring the DSI-0 pll.

Change-Id: I5cd951c76e92bba7b54aa0914317aa3892a868fa
Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>