arch: Disable ARCH_HAVE_FORK for arm64 as a precaution

Summary:
- Temporarily disables ARCH_HAVE_FORK for arm64 to address a crash issue,
  as detailed in apache#9755.
- This is a precautionary measure until a more permanent solution is implemented.

Impact:
- Temporarily limits certain functionalities on arm64,
  but necessary to ensure system stability.

Testing:
- Successfully tested on QEMU-8.1.2.
- Note: please apply the changes from apache/nuttx-apps#1962.

Signed-off-by: Masayuki Ishikawa <[email protected]>

arch/Kconfig

@@ -28,7 +28,6 @@ config ARCH_ARM64
 	select ALARM_ARCH
 	select ARCH_HAVE_BACKTRACE
 	select ARCH_HAVE_INTERRUPTSTACK
-	select ARCH_HAVE_FORK
 	select ARCH_HAVE_STACKCHECK
 	select ARCH_HAVE_CUSTOMOPT
 	select ARCH_HAVE_STDARG_H