Commit d284e6ef0f06 ("treewide: convert mtd-mac-address-increment* to
generic implementation") renamed "mtd-mac-address-increment" property
to "mac-address-increment". Convert remaining usages that have been
added after that.
Fixes: af8a059bb41d ("ath79: add support for GL.iNet GL-XE300") Signed-off-by: Sungbo Eo <mans0n@gorani.run>