platform_data/mlxreg: Extend core platform structure

Add 'capability' field to structure 'mlxreg_core_platform_data'.
The purpose of this filed to indicate  the actual number of the
components within the particular group. Such components could be,
for example the number of the FAN drawers. Some systems are equipped
with FAN drawers with one tachometer inside, others with FAN drawers
with several tachometers inside.
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200923172053.26296-5-vadimp@nvidia.comSigned-off-by: Hans de Goede <hdegoede@redhat.com>

include/linux/platform_data/mlxreg.h

@@ -109,6 +109,7 @@ struct mlxreg_core_item {
  * @features: supported features of device;
  * @version: implementation version;
  * @identity: device identity name;
+ * @capability: device capability register;
  */
 struct mlxreg_core_platform_data {
 	struct mlxreg_core_data *data;
@@ -117,6 +118,7 @@ struct mlxreg_core_platform_data {
 	u32 features;
 	u32 version;
 	char identity[MLXREG_CORE_LABEL_MAX_SIZE];
+	u32 capability;
 };
 
 /**