arm64: dts: exynos: Add cpu cache information to Exynos7

Add CPU caches information to its dt nodes so that the same is available
to userspace via sysfs.  This SoC has 48/32 KB I/D cache
for each cores and 2MB of L2 cache.

Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20210622130551.67446-1-alim.akhtar@samsung.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>