lantiq: Refresh kernel configuration

lantiq: Refresh kernel configuration

This refreshes the configuration for Linux kernel 5.15.

I first selected the xrx200 subtarget and then refreshed the target
kernel configuration using this command:
  make kernel_oldconfig CONFIG_TARGET=target
Then I selected one subtarget after the other and refreshed their
configuration using this command:
  make kernel_oldconfig CONFIG_TARGET=subtarget

I compared the kernel configuration used to compile the kernel from the
build directory for each subtarget before and after this task and it was
still the same.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
[refreshed config for linux 5.15.158]
Signed-off-by: Martin Schiller <ms@dev.tdt.de>