kernel: make uas work during early boot

kernel: make uas work during early boot

Add the uas(p) module to the modules loaded early on the boot process.

The uas(p) is an modern alternative, which is used by the modern USB3
storage cases, compared to the bot protocol. To be able to use uas(p)
storage cases for extroot, the kernel module has to be loaded before the
search for extroot has been called. This patch changes the load order to
support uas(p) storage cases for extroot.

Signed-off-by: Daniel Albers <daniel.albers@public-files.de>