checkpatch.pl: Ignore mdelay instead of udelay
Whereas in Linux, on ARM there is the notion of delay operations and
mdelay and udelay are not the same, here we just have udelay and mdelay
is a trivial wrapper. Tell checkpatch to not complain here.
Reported-by: Bhimeswararao Matsa <bhimeswararao.matsa@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>