armv8: Update erratum number to align with doc

Change the USB erratum number A-050106 to A-050204 as A-050106 is
a duplicate and never be published.

Fixes 0cfa00cd (“armv8: Add workaround for USB erratum A-050106”)
Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>