GIC: Add API to set interrupt routing
Jeenu Viswambharan authored
SPIs can be routed to either a specific PE, or to any one of all
available PEs.

API documentation updated.

Change-Id: I28675f634568aaf4ea1aa8aa7ebf25b419a963ed
Co-authored-by: default avatarYousuf A <yousuf.sait@arm.com>
Signed-off-by: default avatarJeenu Viswambharan <jeenu.viswambharan@arm.com>
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