fs/Kconfig: enable HUGETLBFS only if ARCH_SUPPORTS_HUGETLBFS

fs/Kconfig: enable HUGETLBFS only if ARCH_SUPPORTS_HUGETLBFS

Enable HUGETLBFS only when platform subscrbes via ARCH_SUPPORTS_HUGETLBFS.
Hence select ARCH_SUPPORTS_HUGETLBFS on existing x86 and sparc for their
continuing HUGETLBFS support.  While here also just drop existing 'BROKEN'
dependency.

Link: https://lkml.kernel.org/r/20250711102934.2399533-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Christian Brauner <brauner@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>