ahci_xgene: Implement the xgene_ahci_poll_reg_val to support PMP.
ahci_xgene: Implement the xgene_ahci_poll_reg_val to support PMP.

This patch implements the function xgene_ahci_poll_reg_val
to poll PxCI for multiple IDENTIFY DEVICE commands to finish before
restarting the DMA engine.

Signed-off-by: Suman Tripathi <4acbb9f2b7a6c35ffe616198daf840632ad3a067@apm.com>
Signed-off-by: Tejun Heo <546b05909706652891a87f7bfe385ae147f61f91@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs