arm64: remove redundant 'if HAVE_ARCH_KASAN' in Kconfig

arm64: remove redundant 'if HAVE_ARCH_KASAN' in Kconfig

Since commit 0383808e4d99 ("arm64: kasan: Reduce minimum shadow
alignment and enable 5 level paging"), HAVE_ARCH_KASAN is always 'y'.

The condition 'if HAVE_ARCH_KASAN' is always met.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20240715192843.2201439-1-masahiroy@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>