ARM: net: bpf_jit: code fixing & optimization

in this patch are included:
ARM: net: bpf_jit: fix emit_swap16() for non ARMv6+ -
https://github.com/poondog/kangaroo-m7-mkIII/commit/ad8bd92f51c7c2a9e54092e389c01d8fd391fbee
ARM: 7598/1: net: bpf_jit_32: fix sp-relative load/stores offsets -
https://github.com/poondog/kangaroo-m7-mkIII/commit/b8ffd63d6c1d0b1d1de22aac412cf6bb8bcdd650
ARM: 7597/1: net: bpf_jit_32: fix kzalloc gfp/size mismatch -
https://github.com/poondog/kangaroo-m7-mkIII/commit/38ecb12c62c64fb23fc8698d73041dc7f5290662