Fixes 8G2, where some extra top bits are set but we don't request.

To fix issues on older Android versions.
It won't work on those versions but it also shouldn't break them.

Useful for WOW64, where allocations need to be done in the lower 32-bits
of the AS.

Most custom drivers ship with notgsl or vkbgsl, which should be loaded instead of the system gsl to prevent conflicts.

This avoids common mistakes

Android 15 will allow OEMs to ship arm64-v8a devices with 16KiB page sizes. Devices that use this configuration will not be able to run existing apps that use native code. To be compatible with these devices, applications will need to rebuild all their native code to be 16KiB aligned, and rewrite any code which assumes a specific page size.

This change should allow for page size to be calculated dynamically to support these new devices.