kernel/selftests: seccomp_benchmark fails with timeout in H/KVM

Found that on cycle sru-20210510, on H/KVM 5.11.0-1008.8 :

02:36:23 DEBUG| [stdout] # selftests: seccomp: seccomp_benchmark
02:36:23 DEBUG| [stdout] # sysctl: cannot stat /proc/sys/net/core/bpf_jit_enable: No such file or directory
02:36:23 DEBUG| [stdout] # sysctl: cannot stat /proc/sys/net/core/bpf_jit_harden: No such file or directory
02:38:23 DEBUG| [stdout] #
02:38:23 DEBUG| [stdout] not ok 2 selftests: seccomp: seccomp_benchmark # TIMEOUT 120 seconds

In the previous cycle this test worked, but this one failed due to timeout - I've manually executed in my Hirsute VM and it succeeded in ~100 seconds.

Maybe we need to just bump the timeout.