[FS#916] Add kmod-crypto-gcm as dependency of kmod-ipsec

[LEDE Bugs]

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FS#916 - Add kmod-crypto-gcm as dependency of kmod-ipsec
User who did this: Baptiste Jonglez (bjonglez)
Summary: GCM isn't enabled in kernel by default IPsec config -> Add kmod-crypto-gcm as dependency of kmod-ipsec
Task Type: Bug Report -> Feature Request
Reported Version: lede-17.01 -> All
Status: Unconfirmed -> New

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=916