default or selected kernelversion does not have config value CONFIG_ATM_CLIP.
Result is shown for kernelversion 6.0-rc7

Classical IP over ATM

modulename: clip.ko
configname: CONFIG_ATM_CLIP

Linux Kernel Configuration
└─> Networking support
└─> Networking options
└─> Classical IP over ATM

Classical IP over ATM for PVCs and SVCs, supporting InARP and
ATMARP. If you want to communication with other IP hosts on your ATM
network, you will typically either say Y here or to "LAN Emulation
(LANE)" below.

source code: