imx6: rename target to 'imx'

This is first step in migrating to a generic i.MX target which in the
next steps will also get divided into arch-specific subtargets.

In the result, this will make it possible to support, within a single
target, also other modern NXP i.MX families, like the i.MX 7, i.MX 8
or recently introduced i.MX 9.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

target/linux/imx/Makefile

@@ -5,8 +5,8 @@
 include $(TOPDIR)/rules.mk
 
 ARCH:=arm
-BOARD:=imx6
-BOARDNAME:=NXP i.MX 6
+BOARD:=imx
+BOARDNAME:=NXP i.MX
 FEATURES:=audio display fpu gpio pcie rtc usb usbgadget squashfs targz nand ubifs boot-part rootfs-part
 CPU_TYPE:=cortex-a9
 CPU_SUBTYPE:=neon

target/linux/imx/base-files/lib/preinit/79_move_config

@@ -1,4 +1,4 @@
-. /lib/imx6.sh
+. /lib/imx.sh
 . /lib/functions.sh
 . /lib/upgrade/common.sh
 

target/linux/imx/base-files/lib/upgrade/platform.sh

@@ -2,7 +2,7 @@
 # Copyright (C) 2010-2015 OpenWrt.org
 #
 
-. /lib/imx6.sh
+. /lib/imx.sh
 
 RAMFS_COPY_BIN='blkid jffs2reset'
 

target/linux/imx/profiles/100-default.mk

@@ -8,7 +8,7 @@ define Profile/Default
 endef
 
 define Profile/Default/Description
- Package set compatible with most NXP i.MX 6 based boards.
+ Package set compatible with most NXP i.MX based boards.
 endef
 
 $(eval $(call Profile,Default))