malta: enable VM targets again

These targets are interesting for automated testing. The currently
available targets are from 2017 and either we should enable them again
or delete the remaining files on the download servers.

Signed-off-by: Paul Spooren <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15740
Link: https://github.com/openwrt/openwrt/pull/15740
Signed-off-by: Christian Marangi <[email protected]>

target/linux/malta/be64/target.mk

@@ -1,7 +1,6 @@
 ARCH:=mips64
 CPU_TYPE:=mips64r2
 SUBTARGET:=be64
-FEATURES+=source-only
 BOARDNAME:=Big Endian (64-bits)
 
 define Target/Description

target/linux/malta/le/target.mk

@@ -1,7 +1,6 @@
 ARCH:=mipsel
 CPU_TYPE:=24kc
 SUBTARGET:=le
-FEATURES+=source-only
 BOARDNAME:=Little Endian
 
 define Target/Description

target/linux/malta/le64/target.mk

@@ -1,7 +1,6 @@
 ARCH:=mips64el
 CPU_TYPE:=mips64r2
 SUBTARGET:=le64
-FEATURES+=source-only
 BOARDNAME:=Little Endian (64-bits)
 
 define Target/Description