ARM: dts: omap5: Fix DSI base address and clocks

DSI was not probing due to base address off by 0x1000, and sys_clk
missing.

With this patch, the Pyra display works if HDMI is disabled in the
device tree.

Fixes: 5a507162 ("ARM: dts: Configure interconnect target module for omap5 dsi1")
Signed-off-by: David Shah <dave@ds0.me>
Tested-by: H. Nikolaus Schaller <hns@goldelico.com>
[tony@atomide.com: standardized subject line, added fixes tag]
Signed-off-by: Tony Lindgren <tony@atomide.com>