arm64: fix typos in comments

Fix a typo "cortex"

Signed-off-by: Ken Kurematsu <k.kurematsu@nskint.co.jp>
Link: https://lore.kernel.org/r/OSBPR01MB3288B15006E15C64D4D617F7DBEF9@OSBPR01MB3288.jpnprd01.prod.outlook.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: k-kurematsu

arch/arm64/Kconfig

@@ -687,7 +687,7 @@ config ARM64_ERRATUM_2051678
 	default y
 	help
 	  This options adds the workaround for ARM Cortex-A510 erratum ARM64_ERRATUM_2051678.
-	  Affected Coretex-A510 might not respect the ordering rules for
+	  Affected Cortex-A510 might not respect the ordering rules for
 	  hardware update of the page table's dirty bit. The workaround
 	  is to not enable the feature on affected CPUs.