offline_port: add functionality for OH port driver

Historically the offline port driver did not initialize the frame queues that
entered and exited the OH port and relied on software components (Ethernet
driver, USDPAA, other kernel modules) to initialize those queues.

The last major modification in the offline port driver added capabilities to
initialize ingress queues (queues that enter the Offline Port) simplifying
the work for the Ethernet driver, but maintaining the same complexity in USDPAA
and/or other kernel modules.

This patch adds full capability for initializing both ingress and egress
queues, eliminating the dependency on USDPAA and/or other kernel modules. With
it, complex offload architectures that have OH ports can be largely initialized
by the offline port driver.

The additional device tree attributes that this patch adds are optional and do
not interfere with the current code. Therefore, backward compatibility is
maintained.

This patch also simplifies the initialization of the hardware used by the
macless or the newer Ethernet driver, oNIC. Test scenarios (mainly unit tests)
can be created without using USDPAA or Offload Driver.

The device tree format for the new attributes is:
fsl,qman-frame-queues-ingress = <base_id1 count1 ... base_idn countn>;
fsl,qman-frame-queues-egress = <base_id1 count1 ... base_idn countn>;
fsl,qman-channel-ids-egress = <channel_id1 ... channel_idn>;

The above queues are connected only to DC portals. Frame queues connected to SW
portals should be created from another software entity. Also, if a frame queue
uses different initialization parameters it should be created by another
software entity.

Change-Id: I0fffc6116bbf543542c30eb6225b2a76945d3813
Signed-off-by: Marian Rotariu <marian.rotariu@freescale.com>
Reviewed-on: http://git.am.freescale.net:8181/9648
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Madalin-Cristian Bucur <madalin.bucur@freescale.com>
Reviewed-by: Bogdan Purcareata <bogdan.purcareata@freescale.com>
Reviewed-by: Jose Rivera <German.Rivera@freescale.com>
(cherry picked from commit 43c88bc759c12472262788d8f39dd3d79c6f5e44)
Reviewed-on: http://git.am.freescale.net:8181/10296

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