shr-image.inc: migrate nokia900 to devtmpfs
Without that patch the nokia n900 has no working virtual console:
ssh failed with PTY allocation request failed on channel 0
vala-terminal failed with not giving a prompt, removing udev
fixes theses issues(there was udev and devtmpfs at the same time).
SHR had to choose between devtmpfs and udev for the nokia900,
and devtmpfs was chosen.
The functionality offered by udev is beeing migrated in the
freesmartphone middleware, for instance firmware loading has
been there since a very long time.
Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@no-log.org>