MFC 303688,303750,305166,305167: Centralize and rework page pod handling.

Note that the TOE DDP code in 10 is different from 11 and later and
had to be updated directly.

303688:
cxgbe/t4_tom: Read the chip's DDP page sizes and save them in a
per-adapter data structure.  This replaces a global array with hardcoded
page sizes.

303750:
cxgbe/t4_tom: The page pod arena allocates from pod address space and
not index space.  The minimum valid allocation out of this arena is the
size of a single page pod.

305166:
cxgbe/t4_tom: Add general purpose routines to deal with page pod regions
and allocations within them.  Switch to these routines to manage the TOE
DDP region.

305167:
cxgbe/t4_tom: Two new routines to allocate and write page pods for a
buffer in the kernel's address space.

Sponsored by:	Chelsio Communications

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