generic: add kernel tag to backport patch

In the previous commit, the kernel tag was not added when adding the
backport.

Fixes: 537624db39a9 ("generic: backport missing helper for phy interfaces")
Signed-off-by: Nick Hainke <vincent@systemli.org>

diff --git a/target/linux/generic/backport-6.1/700-net-phylink-add-phylink_get_link_timer_ns-helper.patch b/target/linux/generic/backport-6.1/700-v6.2-net-phylink-add-phylink_get_link_timer_ns-helper.patch
similarity index 100%
rename from target/linux/generic/backport-6.1/700-net-phylink-add-phylink_get_link_timer_ns-helper.patch
rename to target/linux/generic/backport-6.1/700-v6.2-net-phylink-add-phylink_get_link_timer_ns-helper.patch