dt-bindings: arm: cpus: Add edac-enabled property

Some ARM Cortex CPUs including A72 have Error Detection And Correction (EDAC)
support on their L1 and L2 caches. That functionality is in implementation
defined registers, so using it is not safe in virtualized environments or when
EL3 already uses these registers. Add a edac-enabled flag which can be
explicitly set when EDAC can be used.

  [ bp: Massage commit message. ]

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vijay Balakrishna <vijayb@linux.microsoft.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/1752714390-27389-3-git-send-email-vijayb@linux.microsoft.com

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