kernel config BPI-R4 - compress kernel ko modules

Use XZ as `modprobe --version` says
```
kmod version 30
+ZSTD +XZ -ZLIB +LIBCRYPTO -EXPERIMENTAL
```

Reason to do this:
```
root@ratatosk:~# find /lib/modules/6.12.35-current-filogic/ -name '*.ko.xz'|xargs xz -l |tail -n 1
  265     266  5,253.3 KiB     24.3 MiB  0.211  CRC32   265 files
root@ratatosk:~# ls ~tabris/linux-image-current-filogic_25.11.0-*.deb -lhtr
-rw-r--r-- 1 tabris tabris 48M Aug 22 12:04 /home/tabris/linux-image-current-filogic_25.11.0-trunk_arm64__6.12.35-S9403-D0b5d-P0000-C0ef5H2313-HK01ba-Vc222-Bd200-R448a.deb
-rw-r--r-- 1 tabris tabris 28M Aug 23 20:58 /home/tabris/linux-image-current-filogic_25.11.0-trunk_arm64__6.12.35-S9403-D0b5d-P0000-C999999H2313-HK01ba-Vc222-Bd200-R448a.deb

```
So it saves ~20MiB on disc and in the linux-image package as well.

Reasons to not do this:
a) paranoia about the `xz` library compromise [not really an XZ thing].
b) possibility of tooling failures [`MODULE_DECOMPRESS` may save us,
maybe it won't] on older versions of Armbian/debian.
c) could use `zstd` instead.

This is the kind of thing to consider making standard across all board
configs. But I don't own all of the boards so can't hardly test them
all.

Author: tabrisnet

config/kernel/linux-filogic-current.config

@@ -108,6 +108,9 @@ CONFIG_JUMP_LABEL=y
 # CONFIG_STACKPROTECTOR_STRONG is not set
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
+CONFIG_MODULE_COMPRESS=y
+CONFIG_MODULE_COMPRESS_XZ=y
+CONFIG_MODULE_DECOMPRESS=y
 # CONFIG_BLOCK_LEGACY_AUTOLOAD is not set
 CONFIG_BLK_DEV_THROTTLING=y
 # CONFIG_BLK_DEBUG_FS is not set