greybus: power_supply: add missing defines present in the specification

Some of the Greybus properties values (capacity level and scope) even
though they are defined in the specification were missing from the
protocol header.

They still match the kernel ones, but they should be present in there
for protocol sake.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Reviewed-by: Sandeep Patil <sspatil@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus_protocols.h

@@ -570,6 +570,19 @@ struct gb_bootrom_get_vid_pid_response {
 #define GB_POWER_SUPPLY_STATUS_NOT_CHARGING		0x0003
 #define GB_POWER_SUPPLY_STATUS_FULL			0x0004
 
+/* Greybus power supply capacity level values */
+#define GB_POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN		0x0000
+#define GB_POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL		0x0001
+#define GB_POWER_SUPPLY_CAPACITY_LEVEL_LOW		0x0002
+#define GB_POWER_SUPPLY_CAPACITY_LEVEL_NORMAL		0x0003
+#define GB_POWER_SUPPLY_CAPACITY_LEVEL_HIGH		0x0004
+#define GB_POWER_SUPPLY_CAPACITY_LEVEL_FULL		0x0005
+
+/* Greybus power supply scope values */
+#define GB_POWER_SUPPLY_SCOPE_UNKNOWN			0x0000
+#define GB_POWER_SUPPLY_SCOPE_SYSTEM			0x0001
+#define GB_POWER_SUPPLY_SCOPE_DEVICE			0x0002
+
 struct gb_power_supply_get_supplies_response {
 	__u8	supplies_count;
 } __packed;