i3c: fix incorrect address slot lookup on 64-bit

The address slot bitmap is an array of unsigned long's which are the
same size as an int on 32-bit platforms but not 64-bit.  Loading the
bitmap into an int could result in the incorrect status being returned
for a slot and slots being reported as the wrong status.

Fixes: 3a379bbc ("i3c: Add core I3C infrastructure")
Cc: Boris Brezillon <bbrezillon@kernel.org>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Jamie Iles <quic_jiles@quicinc.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210922165600.179394-1-quic_jiles@quicinc.com