linux-phytec-ti

PCI: endpoint: pci-epc-mem: Add support for configurable page size

pci-epc-mem uses a page size equal to *PAGE_SIZE* (usually 4KB) to
manage the address space. However certain platforms like TI's K2G
has a restriction that this address space should be either divided
into 1MB/2MB/4MB or 8MB sizes (Ref: 11.14.4.9.1 Outbound Address
Translation in K2G TRM SPRUHY8F January 2016 – Revised May 2017).
Add support to handle different page sizes here.

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