Moved proj up

FreeRTOS/portable/GCC/ARM_CA53_64_BIT/README.md

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+# ARM_CA53_64_BIT port
+
+Initial port to support Armv8-A architecture in FreeRTOS kernel was written for
+Arm Cortex-A53 processor.
+
+* ARM_CA53_64_BIT
+    * Memory mapped interface to access Arm GIC registers
+
+This port is generic and can be used as a starting point for other Armv8-A
+application processors. Therefore, the port `ARM_CA53_64_BIT` is renamed as
+`ARM_AARCH64`. The existing projects that use old port `ARM_CA53_64_BIT`,
+should migrate to renamed port `ARM_AARCH64`.
+
+**NOTE**
+
+This port uses memory mapped interface to access Arm GIC registers.