ARM: odroid: update .gitignore for boot/compressed
remove needless backup file
remove builded piggy.xzkern
ARM: odroidu2: enable zram and ksm in ubuntu defconfig
Fix following build error and duplicated symbol inline 'get_fimd_global': function with linaro GCC 4.7

Error: selected processor does not support ARM mode `smc #0
remove made ashldi3.S