dt-bindings: iio: adi,ltc2983: Fix 64-bit property sizes

The '/bits/ 64' notation applies the next <> list of values. Another <> list
is encoded as 32-bits by default. IOW, each <> list needs to be preceeded
with '/bits/ 64'.

While the dts format allows this, as a rule we don't mix sizes for DT
properties since all size information is lost in the dtb file.
Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220107032026.2408196-1-robh@kernel.org

Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml

@@ -448,17 +448,17 @@ examples:
                         reg = <20>;
                         adi,sensor-type = <9>; //custom thermocouple
                         adi,single-ended;
-                        adi,custom-thermocouple = /bits/ 64
-                                 <(-50220000) 0>,
-                                 <(-30200000) 99100000>,
-                                 <(-5300000) 135400000>,
-                                 <0 273150000>,
-                                 <40200000 361200000>,
-                                 <55300000 522100000>,
-                                 <88300000 720300000>,
-                                 <132200000 811200000>,
-                                 <188700000 922500000>,
-                                 <460400000 1000000000>; //10 pairs
+                        adi,custom-thermocouple =
+                                 /bits/ 64 <(-50220000) 0>,
+                                 /bits/ 64 <(-30200000) 99100000>,
+                                 /bits/ 64 <(-5300000) 135400000>,
+                                 /bits/ 64 <0 273150000>,
+                                 /bits/ 64 <40200000 361200000>,
+                                 /bits/ 64 <55300000 522100000>,
+                                 /bits/ 64 <88300000 720300000>,
+                                 /bits/ 64 <132200000 811200000>,
+                                 /bits/ 64 <188700000 922500000>,
+                                 /bits/ 64 <460400000 1000000000>; //10 pairs
                };
 
         };