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init: make switch_root reopen stdio if console=hvc0 is set

The driver for the primary console might be compiled as a kernel module
in which case the primary console will not be available until modules
are loaded.

Fix openrc output by passing the console device to switch_root.

Fixes https://gitlab.alpinelinux.org/alpine/mkinitfs/-/merge_requests/99
Ref https://gitlab.alpinelinux.org/alpine/aports/-/issues/13677

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -358,6 +358,7 @@

 	console=*)

 		opt="${opt#*=}"

 		KOPT_consoles="${opt%%,*} $KOPT_consoles"

+		switch_root_opts="-c /dev/${opt%%,*}"

 		continue

 		;;

 	esac

@@ -563,7 +564,7 @@

 		fi

 	done

 	sync

-	exec /bin/busybox switch_root $sysroot $chart_init "$KOPT_init" $KOPT_init_args

+	exec /bin/busybox switch_root $switch_root_opts $sysroot $chart_init "$KOPT_init" $KOPT_init_args

 	echo "initramfs emergency recovery shell launched"

 	exec /bin/busybox sh

 fi

@@ -844,7 +845,7 @@

 [ "$KOPT_splash" = "init" ] && echo exit > $sysroot/$splashfile

 echo ""

-exec /bin/busybox switch_root $sysroot $chart_init "$KOPT_init" $KOPT_init_args

+exec /bin/busybox switch_root $switch_root_opts $sysroot $chart_init "$KOPT_init" $KOPT_init_args

 [ "$KOPT_splash" != "no" ] && echo exit > $sysroot/$splashfile

 echo "initramfs emergency recovery shell launched"