arch/tricore: Fix --help-- in Kconfig

This PR fixes a typo at `--help--` that causes NuttX Builds to fail, it should have been `---help---`. This is a recurring problem, NuttX CI uses a different way of handling NuttX Configs (it doesn't use `tools/configure.sh`)

https://github.com/lupyuen/nuttx-riscv64/actions/runs/22929878852/job/66548808341#step:5:161
```
$ tools/configure.sh rv-virt:nsh
arch/tricore/Kconfig:124: syntax error
arch/tricore/Kconfig:123: unknown option "--help--"
arch/tricore/Kconfig:124:warning: ignoring unsupported character ','
arch/tricore/Kconfig:124: unknown option "In"
```

Signed-off-by: Lup Yuen Lee <luppy@appkaki.com>

Author: lupyuen

arch/tricore/Kconfig

@@ -120,7 +120,7 @@ config ARCH_MPU_CODE_NREGIONS
 
 config HAVE_SECURITY_CORE
 	bool
-	--help--
+	---help---
 		In addition to the 6 cores, tc4xx also has one more security core.
 
 config CPU_COREID