smartpqi: Change alignment for dma tags

Problem: Under certain I/O conditions, a program doing large block disk
reads can cause a controller to crash.

Root Cause: The SCSI read request and destination address in the BDMA
descriptor is incorrect, causing the BDMA engine in the controller to
assert.

Fix: Change the alignment for creating bus_dma_tags in the driver from
PAGE_SIZE (4k) to 1, which allows the controller to manage it's own
address range for BDMA transactions.

Risk: Medium

Exposure: This reverts a change first made to support NVMe drives on
Excalibur. At that time a 4k alignment was necessary. This no longer
seems to be the case.

PR: 259541
Reported by: Ka Ho Ng <khng@freebsd.org>
Reviewed by: imp
Differential Revision:	https://reviews.freebsd.org/D41619

sys/dev/smartpqi/smartpqi_main.c

@@ -629,8 +629,8 @@ smartpqi_attach(device_t dev)
          * Create DMA tag for mapping buffers into controller-addressable space.
          */
         if (bus_dma_tag_create(softs->os_specific.pqi_parent_dmat,/* parent */
-				PAGE_SIZE, 0,		/* algnmnt, boundary */
-				BUS_SPACE_MAXADDR,/* lowaddr */
+				1, 0,			/* algnmnt, boundary */
+				BUS_SPACE_MAXADDR,	/* lowaddr */
 				BUS_SPACE_MAXADDR,	/* highaddr */
 				NULL, NULL,		/* filter, filterarg */
 				(bus_size_t)softs->pqi_cap.max_sg_elem*PAGE_SIZE,/* maxsize */