kernel: reorder kernel symbol configs

kernel: reorder kernel symbol configs

Sort kernel configuration files alphabetically. Also resolve the
"CONFIG_ARM_PAN" conflict introduced in commit
057a0a075edc ("generic: Fix up the v6.12 config for ARM"). Based on
the original PR comment[1], this symbol should be disabled by default.

[1] https://github.com/openwrt/openwrt/pull/18900#discussion_r2106253528
Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18947
Signed-off-by: Hauke Mehrtens <[email protected]>