irqdomain: Port system to new API

The following merge commit chose the irq_domain implementation
from AU_LINUX_ANDROID_ICS.04.00.04.00.126 instead of the version
in v3.4.

commit f132c6cf
Merge: 23016def 3f6240f3
Author: Steve Muckle <smuckle@codeaurora.org>
Date:   Wed Jun 6 18:30:57 2012 -0700

    Merge commit 'AU_LINUX_ANDROID_ICS.04.00.04.00.126' into
    msm-3.4

Since this version is inconsistent with the upstream,
port the irq_domain framework to the version in v3.4 and
makes all necessary changes to clients that are out of spec.

Details of client ports are below.

-Update the qpnp-int driver for revmap irq_domain API. The revmap
irq_domain implementation introduces a reverse lookup scheme using
a radix tree. This scheme is useful for controllers like qpnp-int
that require a large range of hwirqs.

-Bring the ARM GIC driver up to v3.4, being careful
to port existing CAF changes.

-Partially port the gpio-msm-common driver to the new irq_domain API.
Enable the gpio-msm-common driver to work with the new irq_domain
API using a linear revmap. It is not a full port since irq_domain
is still only registered for Device Tree configurations. It should
be registered even for legacy configurations.

In addition, the irq_domains .map function should be setting all
the fields currently done in msm_gpio_probe(). That's not
currently possible since msm_gpio_probe is invoked
unconditionally - even from Device Tree configurations.

Finally, gpio-msm-common should be converted into a real
platform_device so that probe() is invoked due to driver and
device matching.

Change-Id: I19fa50171bd244759fb6076e3cddc70896d8727b
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>