supress-gcc-warnings: add const qualifier

Signed-off-by: Axel Heider <axelheider@gmx.de>

libplatsupport/src/mach/zynq/mux.c

diff --git a/libplatsupport/src/mach/zynq/mux.c b/libplatsupport/src/mach/zynq/mux.c
index 9a1af44..2cc4a12 100644
--- a/libplatsupport/src/mach/zynq/mux.c
+++ b/libplatsupport/src/mach/zynq/mux.c
@@ -32,7 +32,7 @@
 }
 
 static int zynq_mux_feature_enable(
-    mux_sys_t *mux,
+    const mux_sys_t *mux,
     mux_feature_t mux_feature,
     UNUSED enum mux_gpio_dir mgd)
 {