kernel: kmod-can: Fix build of can drivers

Many can kernel modules are now gated by the newly introduced
CONFIG_CAN_NETLINK configuration option. Activate it to build the can
drivers again.
This was changed in this upstream Linux commit:
https://git.kernel.org/linus/df6ad5dd838e0fa543ca28ca6154901fa65a9443

This should fix these warnings with kernel 6.1 and 6.6:
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-c-can is not available in the kernel config - generating empty package
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-c-can-pci is not available in the kernel config - generating empty package
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-c-can-platform is not available in the kernel config - generating empty package
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-mcp251x is not available in the kernel config - generating empty package
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-slcan is not available in the kernel config - generating empty package
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-usb-8dev is not available in the kernel config - generating empty package
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-usb-ems is not available in the kernel config - generating empty package
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-usb-kvaser is not available in the kernel config - generating empty package
logs/package/kernel/linux/compile.txt:WARNING: kmod-can-usb-peak is not available in the kernel config - generating empty package

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>