Use managed PCI functions such as pcim_enable_device() and
pcim_iomap_regions() to simplify exception handling code.

Link: https://lore.kernel.org/r/1629799260-120116-2-git-send-email-john.garry@huawei.comSigned-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>