Essential Product - Initial AOSP release

update kernel prebuilt

20d93d17b13e Revert "usb: dwc3: turn off VBUS when leaving host mode"
56bbadaae Release 5.1.1.75M

Change-Id: I817720dd420be438a5c031b81d02e735c4be4e48
Signed-off-by: Jean-Baptiste Théou <jb@essential.com>