arm64: fix NUMA Kconfig typos

Fix typos in arch/arm64/Kconfig:

- spell Numa as NUMA
- add hyphenation to Non-Uniform

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>