arm64: improve CONFIG_MAX_XLAT_TABLES default value

The typical number of needed translation tables depends on memory
domain usage and userspace support, but also on the virtual address
space width due to the number of translation levels involved.
Reflect that in the default value.

Also fix a related comment where values were off by 1.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
2 files changed