mailbox: Introduce Qualcomm APCS IPC driver
This implements a driver that exposes the IPC bits found in the APCS Global block in various Qualcomm platforms. The bits are used to signal inter-processor communication signals from the application CPU to other masters. Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
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