toolchain: Add cortex-M85 support
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Make necessary changes to add cortex-M85 support.
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The CMSIS definitions for System control Register not in SCB (SCnSCB) are deprecated on M85 header. Armv8m based cores define a separate Implementation Control Registers instead. Hence change the arch/nvic reference accordingly.
Signed-off-by: Tintu Thomas tintu.thomas@arm.com