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aarch64: Enable the instruction cache

Peter Hoyes requested to merge pethoy01/aarch64-icache into main

Enable the Instruction access Cacheability control bit in SCTLR_EL2 at the same time as enabling the MPU. This improves the performance of instruction fetches on hardware where this is implemented.

Signed-off-by: Peter Hoyes peter.hoyes@arm.com

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