Instead of the bitband device doing a cpu_physical_memory_read/write,
make it take a MemoryRegion which specifies where it should be
accessing, and use address_space_read/write to access the
corresponding AddressSpace.

Since this entails pretty much a rewrite, convert away from
old_mmio in the process.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1487604965-23220-8-git-send-email-peter.maydell@linaro.org

Make the ARMv7M object take a memory region link which it uses
to wire up the bitband rather than having them always put
themselves in the system address space.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1487604965-23220-6-git-send-email-peter.maydell@linaro.org

Create a proper QOM object for the armv7m container, which
holds the CPU, the NVIC and the bitband regions.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Message-id: 1487604965-23220-4-git-send-email-peter.maydell@linaro.org