rockchip: fix kernel tag for backported patches

rockchip: fix kernel tag for backported patches

These patches were actually merged in kernel 6.19 instead of 6.18,
fix them to avoid confusing when moving to new kernel version.

While at it, refresh the RK3528 PCIE L1ss patch since it was
accepted in 6.19 as well.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>
Link: https://github.com/openwrt/openwrt/pull/21419
(cherry picked from commit c79fa27cbf722ef3f34754ce87f2831c62663213)
Link: https://github.com/openwrt/openwrt/pull/21448
Signed-off-by: Robert Marko <robimarko@gmail.com>