gcov: add ARM64 to GCOV_PROFILE_ALL

gcov: add ARM64 to GCOV_PROFILE_ALL

Following up the arm testing of gcov, turns out gcov on ARM64 works fine
as well.  Only change needed is adding ARM64 to Kconfig depends.

Tested with qemu and mach-virt

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Acked-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit f601de204465048bdf0d5537f630729622ebc3a6)
Signed-off-by: Mark Brown <broonie@kernel.org>