Fix make qemu rasperry pi 3b emulation

This fixes stock make qemu to emulate RPi3B+ when .configured with BOARD=raspi3bp. In addition to the usual livedisk scenario, this makes "live=no" to boot off sdcard. USB net is emulated as well, altough it is not supported by Redox.

mk/podman.mk

@@ -10,7 +10,7 @@ PODMAN_HOME?=$(ROOT)/build/podman
 ## Podman command with its many arguments
 PODMAN_VOLUMES?=--volume $(ROOT):$(CONTAINER_WORKDIR):Z --volume $(PODMAN_HOME):/home:Z
 PODMAN_ENV?=--env PATH=/home/poduser/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin --env PODMAN_BUILD=0
-PODMAN_CONFIG?=--env ARCH=$(ARCH) --env CONFIG_NAME=$(CONFIG_NAME) --env FILESYSTEM_CONFIG=$(FILESYSTEM_CONFIG)
+PODMAN_CONFIG?=--env ARCH=$(ARCH) --env BOARD=$(BOARD) --env CONFIG_NAME=$(CONFIG_NAME) --env FILESYSTEM_CONFIG=$(FILESYSTEM_CONFIG)
 PODMAN_OPTIONS?=--rm --workdir $(CONTAINER_WORKDIR) --userns keep-id --user `id -u` --interactive --tty --env TERM=$(TERM)
 PODMAN_RUN?=podman run $(PODMAN_OPTIONS) $(PODMAN_VOLUMES) $(PODMAN_ENV) $(PODMAN_CONFIG) $(IMAGE_TAG)