aic94xx: update BIOS image from user space.

1. Create a file "update_bios" in sysfs to allow user to update bios from user space.

2. The aic94xx BIOS image file can be downloaded from web site "http://www.adaptec.com/en-US/downloads/bios_fw/bios_fw_ver?productId=SAS-48300&dn=Adaptec+Serial+Attached+SCSI+48300" and copy the BIOS image into /lib/firmware folder.

3. The aic994xx will accept "update bios_file" and "verify bios_file" commands to perform update and verify BIOS image .

For example:

Type "echo "update asc483c01.ufi" > /sys/devices/.../update_bios"
to update BIOS image from /lib/firmware/as483c01.ufi file into HBA's flash memory.

Type "echo "verify asc483c01.ufi" > /sys/devices/.../update_bios"
to verify BIOS image between /lib/firmware/asc48c01.ufi file and HBA's flash memory.

4. Type "cat /sys/devices/.../update_bios" to view the status or result of updating BIOS.

diff -urN a/drivers/scsi/aic94xx/aic94xx_hwi.h b/drivers/scsi/aic94xx/aic94xx_hwi.h
@@ -72,6 +72,7 @@
 	u8     manuf;
 	u8     dev_id;
 	u8     sec_prot;
+        u8     method;
 
 	u32    dir_offs;
 };

@@ -216,6 +217,8 @@
 	struct dma_pool  *scb_pool;
 
 	struct asd_seq_data  seq; /* sequencer related */
+        u32    bios_status;
+	const struct firmware *bios_image;
 };
 
 /* ---------- Common macros ---------- */