defaultenv: boot: add serverip to static ip configuration
If a (different) server is supplied to the "nfsroot" parameter, the kernel
will choose that one.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>