Revert "usb: fix adb not running at early boot"

This reverts commit 840343e18067618e7cdef9011922b56b9e4816e6.
Disable SUSTAIN_LOAD

Signed-off-by: Xmister <xmisterhu@gmail.com>
Set readahead to 128KB

Signed-off-by: Xmister <xmisterhu@gmail.com>