intel/isl: Fix isl_color_value_unpack to match the prototype

The prototype uses a pointer and the actual function definition had an
array.  For some reason, GCC never complained about this until GCC 11.
This fixes a compile warning when building with GCC 11.

Fixes: 09ced654 "intel/isl: Add format conversion code"
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <!10537>

src/intel/isl/isl_format.c

@@ -1318,7 +1318,7 @@ unpack_channel(union isl_color_value *value,
 void
 isl_color_value_unpack(union isl_color_value *value,
                        enum isl_format format,
-                       const uint32_t data_in[4])
+                       const uint32_t *data_in)
 {
    const struct isl_format_layout *fmtl = isl_format_get_layout(format);
    assert(fmtl->colorspace == ISL_COLORSPACE_LINEAR ||