fix(plat/xilinx/versal/include): correct IPI buffer offset

Use proper offset for IPI data based on offset for IPI0
channel.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Abhyuday Godhasara <abhyuday.godhasara@xilinx.com>
Change-Id: I3070517944dd353c3733aa595df0da030127751a
1 file changed