qoriq: drop source-only flag

While the qoriq target currently supports only one device, the
WatchGuard Firebox M300, the feedback from people using it is that it's
a great bang for the buck. Additionally, people suggest having no
snapshots available hurts adoption.

Signed-off-by: Stijn Tintel <[email protected]>

target/linux/qoriq/Makefile

@@ -8,7 +8,7 @@ ARCH:=powerpc64
 BOARD:=qoriq
 BOARDNAME:=NXP QorIQ (PowerPC)
 CPU_TYPE:=e5500
-FEATURES:=boot-part ext4 fpu legacy-sdcard powerpc64 ramdisk rootfs-part rtc source-only
+FEATURES:=boot-part ext4 fpu legacy-sdcard powerpc64 ramdisk rootfs-part rtc
 SUBTARGETS:=generic
 
 KERNEL_PATCHVER:=6.6