uml: revert accidentally committed change

Signed-off-by: Jo-Philipp Wich <[email protected]>

target/linux/uml/Makefile

@@ -18,7 +18,6 @@ ARCH:=$(shell uname -m | sed \
 	-e 's/sh[234]/sh/' \
 	-e 's/armeb/arm/' \
 )
-ARCH_PACKAGES:=uml
 BOARD:=uml
 BOARDNAME:=User Mode Linux
 FEATURES:=ext4 audio