[FS#353] [lantiq-xrx200] ifx-vmmc fails to compile

[LEDE Bugs]

The following task is now closed:

FS#353 - [lantiq-xrx200] ifx-vmmc fails to compile
User who did this - Hauke Mehrtens (Hauke)

Reason for closing: Fixed
Additional comments about closing: CONFIG_VOICE_CPE_VMMC_PMC is not supported in LEDE, I just marked it as broken here:
https://git.lede-project.org/4af4f214926b3e8ebdd1830010ccdc8d0fb6c3ff

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=353