docs: AD7616 documentation update

Remove reference to the axi_ad7616 interrupt as it does not exist in the HDL
design.

Signed-off-by: Pop Ioan Daniel <[email protected]>

Author: PIoandan

docs/projects/ad7616_sdz/index.rst

@@ -239,7 +239,6 @@ Instance name   HDL Linux Zynq Actual Zynq
 =============== === ========== ===========
 axi_ad7616_dma  13  57         89
 spi_ad7616 **   12  56         88
-axi_ad7616 *    10  54         87
 =============== === ========== ===========
 
 .. admonition:: Legend