scripts/coverity-scan/COMPONENTS.md: Add loongarch component

Add the component regex for the new loongarch target.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20220718142310.16013-2-peter.maydell@linaro.org

scripts/coverity-scan/COMPONENTS.md

@@ -143,3 +143,6 @@ testlibs
 
 tests
   ~ (/qemu)?(/tests/.*)
+
+loongarch
+  ~ (/qemu)?((/include)?/hw/(loongarch/.*|.*/loongarch.*)|/target/loongarch/.*)