scsi: vmw_pvscsi: No need to clear memory after a dma_alloc_coherent() call

scsi: vmw_pvscsi: No need to clear memory after a dma_alloc_coherent() call

dma_alloc_coherent() already clear the allocated memory, there is no need
to explicitly call memset().

Since 'config_page' and 'header' are the same, a memset() call can be
avoided.

Link: https://lore.kernel.org/r/cd1220c628c89465dcfcbf4aa9bd53110898a529.1648067518.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>