ath79: move mikrotik-caldata.sh to target base-files

Mikrotik devices will be found in both generic and nand subtargets.

The file mikrotik-caldata.sh, currently used in generic, contains
a few lines of code that would need to be duplicated for nand
support. Instead of duplicating it, move it to target base-files,
as size impact is small and the maintenance gain should outweigh it.

This is changed separately to make life easier for the people
currently working on Mikrotik NAND support.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

target/linux/ath79/generic/base-files/lib/functions/mikrotik-caldata.sh

@@ -1,21 +0,0 @@
-# Copyright (C) 2019 Robert Marko <robimarko@gmail.com>
-# Copyright (C) 2019 Roger Pueyo Centelles <roger.pueyo@guifi.net>
-#
-# Helper function to extract MAC addresses and calibration data for MikroTik
-#
-
-mikrotik_caldata_extract() {
-	local part=$1
-	local offset=$(($2))
-	local count=$(($3))
-	local mtd
-	local erdfile="/lib/firmware/erd.bin"
-
-	mtd=$(find_mtd_chardev $part)
-	[ -n "$mtd" ] || caldata_die "no mtd device found for partition $part"
-
-	rbextract -e $mtd $erdfile
-
-	dd if=$erdfile of=/lib/firmware/$FIRMWARE iflag=skip_bytes bs=$count skip=$offset count=1 2>/dev/null || \
-		caldata_die "failed to extract calibration data from $mtd"
-}