All the users of the cross class I could find redefine the do_install
function. It is unusual and likely undesirable for the class to be
changing this from the default and likely a leftover from different
times. Remove it as it isn't doing anything.
[YOCTO #9272]
(From OE-Core rev: 72f0e03a6909e6856510d913863fc9301de32cec)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>