src/bootchooser: handle external dtb also in barebox_state_set()
src/bootchooser: handle external dtb also in barebox_state_set()

While barebox_state_get() allows passing -i argument to barebox-state
when 'barebox-dtbpath' is set, barebox_state_set() ignored this.
This prevents the feature from being useful.

Fixes commit 9e13bdd5 ("src: allow passing separate devicetree file to
barebox-state").

Signed-off-by: Enrico Joerns <a2e5f936c390f36494e46e71bcfbe365bb1e8c49@pengutronix.de>

jluebbe/rauc,rauc/rauc,ejoerns/rauc,ejoerns/rauc,jluebbe/rauc,rauc/rauc,jluebbe/rauc,rauc/rauc,ejoerns/rauc