MinsOS v0.3.1 - KernelSU modules mount, safe mode exists, the touchpad taps

Three fixes, all of them in the kernel, all of them invisible from userspace:

- ksu_handle_sys_read was never called from SYSCALL_DEFINE3(read), so ksud never
  ran at boot and no module was ever promoted or mounted. Root was unaffected
  because it rides the execve and open hooks, which is why this read as a module
  bug for three releases.
- ksu_handle_input_handle_event was never called from input_handle_event(), so
  safe mode - the escape hatch from a module boot loop - did not exist.
- stm32_pogo_touchpad.c never called input_mt_report_pointer_emulation(), so the
  Book Cover touchpad reported contacts belonging to no finger and tap-to-click
  could never fire.

Also: super partition sizes are now measured from this tablet's own firmware
rather than copied from another ROM's tree, where they were 116 MiB too large.

Verified on device, not in a build log: the rc hook firing at boot, modules
promoted, module content readable at its /system path from inside a running app,
safe mode recovering a deliberately broken boot, BTN_TOOL_FINGER present where it
had never appeared, and the shipped boot.img byte-identical to the image those
results came from.

sha256 e6e2168b6e0ff29d686f118a2bcc1c80cf0ca7dccb296337d9c20842290f5ab5