ath79: split base-files into subtargets

While most of the target's contents are split into subtargets, the
base-files are maintained for the target as a whole.

However, OpenWrt already implements a mechanism that will use (and
even prefer) files in the subtargets' directories. This can be
exploited to make several scripts subtarget-specific and thus save
some space (especially helpful for the tiny devices).

The only script remaining in parent base-files is
/etc/hotplug.d/ieee80211/00-wifi-migration, everything else is
moved/split.

Note that this will increase overall code lines, but reduce code
per subtarget.

base-files ipk size reduction:
master (generic)   49135 B
split (generic)    48533 B (- 0.6 kiB)
split (tiny)       43337 B (- 5.7 kiB)
split (nand)       44423 B (- 4.6 kiB)

Tested on TL-WR1043ND v4 (generic) and TL-WR841N v12 (tiny).

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

target/linux/ath79/tiny/base-files/etc/hotplug.d/firmware/10-ath9k-eeprom

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+[ -e /lib/firmware/$FIRMWARE ] && exit 0
+
+. /lib/functions/caldata.sh
+
+board=$(board_name)
+
+case "$FIRMWARE" in
+"ath9k-eeprom-pci-0000:00:00.0.bin")
+	case $board in
+	buffalo,whr-g301n|\
+	tplink,tl-wr841-v5|\
+	tplink,tl-wr941-v4)
+		caldata_extract "art" 0x1000 0xeb8
+		;;
+	netgear,wnr1000-v2|\
+	netgear,wnr2000-v3|\
+	netgear,wnr612-v2|\
+	on,n150r|\
+	tplink,tl-mr3220-v1|\
+	tplink,tl-mr3420-v1|\
+	tplink,tl-wr740n-v1|\
+	tplink,tl-wr740n-v3|\
+	tplink,tl-wr741-v1|\
+	tplink,tl-wr743nd-v1|\
+	tplink,tl-wr841-v7)
+		caldata_extract "art" 0x1000 0x1000
+		;;
+	pqi,air-pen)
+		caldata_extract "art" 0x1000 0x7d2
+		;;
+	*)
+		caldata_die "board $board is not supported yet"
+		;;
+	esac
+	;;
+esac