x86: remove maintainer override for x86_64

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/x86/64/target.mk

@@ -1,7 +1,6 @@
 ARCH:=x86_64
 BOARDNAME:=x86_64
 DEFAULT_PACKAGES += kmod-button-hotplug kmod-e1000e kmod-e1000 kmod-r8169
-MAINTAINER:=Imre Kaloz <[email protected]>
 
 define Target/Description
         Build images for 64 bit systems including virtualized guests.