kernel: add missing version number to the page pool backport patch

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/target/linux/generic/backport-6.6/620-01-page_pool-fragment-API-support-for-32-bit-arch-with-.patch b/target/linux/generic/backport-6.6/620-01-v6.7-page_pool-fragment-API-support-for-32-bit-arch-with-.patch
similarity index 100%
rename from target/linux/generic/backport-6.6/620-01-page_pool-fragment-API-support-for-32-bit-arch-with-.patch
rename to target/linux/generic/backport-6.6/620-01-v6.7-page_pool-fragment-API-support-for-32-bit-arch-with-.patch