linux-phytec-ti

PCI: endpoint: Add support to allocate aligned buffers to be mapped in BARs

Modify pci_epf_alloc_space API to take alignment size as argument in
order to argument in order to allocate aligned buffers to be mapped to
BARs.

Add 'align' parameter to epc_features which can be used by platform
drivers to specifiy the BAR allocation alignment requirements and use
this while invoking pci_epf_alloc_space.

This is mainly required for Synopsys Designware PCIe core which masks
the lower bits based on the BAR size (See "I/O and MEM Match Modes"
section in DesignWare Cores PCI Express Controller Databook version
4.90a).

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>