arc: Rename use_outfile to out_dir + use as is

Bug: 142684959
Bug: 136273873
Bug: 139379357
Bug: 138805202
Bug: 142685922
Test: adb shell bugreport
Test: atest dumpstate_test
Test: flash android to dut, android-sh, setenforce 1, arc-bugreport
Change-Id: Ia2bb2d4609467d902ce7424d882ed88422867d0b