arm64: zynqmp: Fix gpio comment about No of gpios

There are total 174 gpios but from 0 - 173 that's why fix comment to
reflect it.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/c7e94b334e7dd6297e0d3a36a6a3d04bd7e9e967.1688992653.git.michal.simek@amd.com
diff --git a/arch/arm/dts/zynqmp-zcu216-revA.dts b/arch/arm/dts/zynqmp-zcu216-revA.dts
index 574e484..43eeaec 100644
--- a/arch/arm/dts/zynqmp-zcu216-revA.dts
+++ b/arch/arm/dts/zynqmp-zcu216-revA.dts
@@ -228,7 +228,7 @@
 		  "", "", "", "", "", /* 155 - 159 */
 		  "", "", "", "", "", /* 160 - 164 */
 		  "", "", "", "", "", /* 165 - 169 */
-		  "", "", "", ""; /* 170 - 174 */
+		  "", "", "", ""; /* 170 - 173 */
 };
 
 &gpu {