ARM support added

ARM support added

* fix compilation errors on 32bit systems regarding int128
* add function calling convention for ARM (R0-R3) as defined
  in "Procedure Call Standard for the ARM Architecture"
* disable including kernel header files with ARM assembly code
  as for arm64 (https://patchwork.kernel.org/patch/7605601/)
* provide BPF syscall number for ARM (386)
  as defined in kernel src: linux/arch/arm/tools/syscall.tbl
* create clang driver for armv7l-tizen-linux-gnueabi triple
* fix libbcc python/C wrapper with proper arguments types
* define generic PT_REGS macros for ARM

Change-Id: Ifbd2ea3f18a8851e8b93b6936548b097bbe66ef7