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>

diff --git a/target/linux/ath79/generic/base-files/lib/functions/mikrotik-caldata.sh b/target/linux/ath79/base-files/lib/functions/mikrotik-caldata.sh
similarity index 100%
rename from target/linux/ath79/generic/base-files/lib/functions/mikrotik-caldata.sh
rename to target/linux/ath79/base-files/lib/functions/mikrotik-caldata.sh