DT: hwspinlock: add the CSR atlas7 hwspinlock bindings document

The Hardware Spinlock device on atlas7 provides hardware assistance
for synchronization between the multiple processors in the system
(dual Cortex-A7, CAN bus Cortex-M3 and audio DSP).
This patch adds the DT bindings information for this hwspinlock
module.

Reviewed-by: Suman Anna <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
Signed-off-by: Wei Chen <[email protected]>
Signed-off-by: Barry Song <[email protected]>
Signed-off-by: Ohad Ben-Cohen <[email protected]>

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