package/zram: fix up Kconfig behaviour for kernel 6.12

package/zram: fix up Kconfig behaviour for kernel 6.12

The initial 6.12 merge leaves package/zram menuconfig behaviour confusing.
Selecting "kmod-zram" opens a submenu of the available algorithms to build
and the actual algo to use. However, when "lzo-rle" is shown as the default
used, it still remains missing from the available list. Only enabling a
_different_ compression algo to build will also reveal "lzo-rle" as
available.

Update the Kconfig to show "lzo-rle" as available if used/referenced.

Fixes: 4708057e27 ("package/zram: update for kernel 6.12")
Signed-off-by: Tony Ambardar <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18712
Signed-off-by: Hauke Mehrtens <[email protected]>