Update to 5.13-rc4
    
    - eliminate 3 patches
      - patches.suse/bpf-Fix-alu32-const-subreg-bound-tracking-on-bitwise.patch
      - patches.suse/bpf-Prevent-writable-memory-mapping-of-read-only-rin.patch
      - patches.suse/bpf-ringbuf-Deny-reserve-of-buffers-larger-than-ring.patch
    - update configs
      - BPF_UNPRIV_DEFAULT_OFF=n (backward compatible)
      - MEMTEST=y (riscv64 only, enabled on most architectures)