generic: disable kernel SWAP support (#3189)

We don't employ swap using zram anymore with Gluon. Thus, we can disable
SWAP in the kernel.

Signed-off-by: David Bauer <mail@david-bauer.net>

targets/generic

@@ -64,6 +64,7 @@ config('KERNEL_CGROUPS', false)
 config('KERNEL_IP_MROUTE', false)
 config('KERNEL_IPV6_MROUTE', false)
 config('KERNEL_IPV6_SEG6_LWTUNNEL', false)
+config('KERNEL_SWAP', false)
 config('SECCOMP', false)
 config('KERNEL_SECCOMP', false)
 -- kmod-mt7915e pulls in CONFIG_KERNEL_RELAY