arm64: defconfig update for LTP

This patch adds several defconfig options required primarily by the LTP
test suite.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Git-commit: 8907272849f923a807d33e71e73dfb343bfb34ab
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>