stm32: Align ethernet config name to netnsh
nsh-ethernet was only used for stm32f7*-disco,
other configurations with network enabled are commonly
named netnsh or derived: (eg: nucleo-144/f7670-netnsh)
Change-Id: I80a33c8e22fbc7ccc9caf6b483478ae2c3a075ad
Signed-off-by: Philippe Coval <p.coval@samsung.com>
Approved-by: GregoryN <gnutt@nuttx.org>