Update CMakeLists.txt to proper name for the ports (#1129)

diff --git a/portable/CMakeLists.txt b/portable/CMakeLists.txt
index 819e2c1..5533975 100644
--- a/portable/CMakeLists.txt
+++ b/portable/CMakeLists.txt
@@ -798,8 +798,8 @@
     $<$<STREQUAL:${FREERTOS_PORT},GCC_ARM_CA9>:${CMAKE_CURRENT_LIST_DIR}/GCC/ARM_CA9>
 
     # ARMv8-A ports for GCC
-    $<$<STREQUAL:${FREERTOS_PORT},GCC_ARM_AARCH64>:${CMAKE_CURRENT_LIST_DIR}/GCC/Arm_AARCH64>
-    $<$<STREQUAL:${FREERTOS_PORT},GCC_ARM_AARCH64_SRE>:${CMAKE_CURRENT_LIST_DIR}/GCC/Arm_AARCH64_SRE>
+    $<$<STREQUAL:${FREERTOS_PORT},GCC_ARM_AARCH64>:${CMAKE_CURRENT_LIST_DIR}/GCC/ARM_AARCH64>
+    $<$<STREQUAL:${FREERTOS_PORT},GCC_ARM_AARCH64_SRE>:${CMAKE_CURRENT_LIST_DIR}/GCC/ARM_AARCH64_SRE>
 
     # ARMv6-M port for GCC
     $<$<STREQUAL:${FREERTOS_PORT},GCC_ARM_CM0>:${CMAKE_CURRENT_LIST_DIR}/GCC/ARM_CM0>