iio: hid-sensor-als: Remove hardcoding of values for enums

Remove hardcoding of values for enum CHANNEL_SCAN_INDEX_INTENSITY and
CHANNEL_SCAN_INDEX_ILLUM.

Signed-off-by: Srinivas Pandruvada <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/light/hid-sensor-als.c

···
 #include "../common/hid-sensors/hid-sensor-trigger.h"
 
 enum {
-	CHANNEL_SCAN_INDEX_INTENSITY = 0,
-	CHANNEL_SCAN_INDEX_ILLUM = 1,
+	CHANNEL_SCAN_INDEX_INTENSITY,
+	CHANNEL_SCAN_INDEX_ILLUM,
 	CHANNEL_SCAN_INDEX_MAX
 };