i3c: Document I3C_ADDR_SLOT_EXT_STATUS_MASK

As the mask is part of the enum, document it.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/r/20241102132841.2446176-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

include/linux/i3c/master.h

@@ -298,6 +298,7 @@ enum i3c_open_drain_speed {
  * @I3C_ADDR_SLOT_I2C_DEV: address is assigned to an I2C device
  * @I3C_ADDR_SLOT_I3C_DEV: address is assigned to an I3C device
  * @I3C_ADDR_SLOT_STATUS_MASK: address slot mask
+ * @I3C_ADDR_SLOT_EXT_STATUS_MASK: address slot mask with extended information
  * @I3C_ADDR_SLOT_EXT_DESIRED: the bitmask represents addresses that are preferred by some devices,
  *			       such as the "assigned-address" property in a device tree source.
  * On an I3C bus, addresses are assigned dynamically, and we need to know which