gcov: enable GCOV_PROFILE_ALL from ARCH Kconfigs

gcov: enable GCOV_PROFILE_ALL from ARCH Kconfigs

Following the suggestions from Andrew Morton and Stephen Rothwell,
Dont expand the ARCH list in kernel/gcov/Kconfig. Instead,
define a ARCH_HAS_GCOV_PROFILE_ALL bool which architectures
can enable.

set ARCH_HAS_GCOV_PROFILE_ALL on Architectures where it was
previously allowed + ARM64 which I tested.

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Cc: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 957e3facd147510f2cf8780e38606f1d707f0e33)
Signed-off-by: Mark Brown <broonie@kernel.org>
Conflicts:
	arch/arm/Kconfig
	arch/arm64/Kconfig
	arch/microblaze/Kconfig
	arch/s390/Kconfig
	arch/x86/Kconfig