dt: otg: update doc with nvidia,enable-host-peripheral-transitions

dt: otg: update doc with nvidia,enable-host-peripheral-transitions

Update the doc with dt node field enable-host-peripheral-transitions.
Enabling this will allow otg driver to allow host to peripheral
transitions and vice versa. And remove nvidia,enable-event-serialization.

Bug 1653886

Change-Id: Ifac1c1c46567f9c0a0164f85d4ecebc5b8a98532
Signed-off-by: Rakesh Babu Bodla <rbodla@nvidia.com>
Reviewed-on: http://git-master/r/827402
GVS: Gerrit_Virtual_Submit
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>