scsi: aacraid: Fix undefined behavior due to shift overflowing the constant

Fix:

drivers/scsi/aacraid/commsup.c: In function ‘aac_handle_sa_aif’:
drivers/scsi/aacraid/commsup.c:1983:2: error: case label does not reduce to an integer constant
case SA_AIF_BPCFG_CHANGE:
^~~~

See https://lore.kernel.org/r/[e-mail] for the gory
details as to why it triggers with older gccs only.

Link: https://lore.kernel.org/r/[e-mail]
Cc: Adaptec OEM Raid Solutions <[e-mail]>
Cc: "James E.J. Bottomley" <[e-mail]>
Cc: "Martin K. Petersen" <[e-mail]>
Cc: [e-mail]
Reviewed-by: Randy Dunlap <[e-mail]>
Signed-off-by: Borislav Petkov <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/aacraid/aacraid.h

···
 #define SA_AIF_PDEV_CHANGE		(1<<4)
 #define SA_AIF_LDEV_CHANGE		(1<<5)
 #define SA_AIF_BPSTAT_CHANGE		(1<<30)
-#define SA_AIF_BPCFG_CHANGE		(1<<31)
+#define SA_AIF_BPCFG_CHANGE		(1U<<31)
 
 #define HBA_MAX_SG_EMBEDDED		28
 #define HBA_MAX_SG_SEPARATE		90