fix: add build tags to ensure that tkey target has stubs for runtime/interrupt package

Signed-off-by: deadprogram <ron@hybridgroup.com>

src/runtime/interrupt/interrupt_none.go

@@ -1,4 +1,4 @@
-//go:build !baremetal
+//go:build !baremetal || tkey
 
 package interrupt
 

src/runtime/interrupt/interrupt_tinygoriscv.go

@@ -1,4 +1,4 @@
-//go:build tinygo.riscv
+//go:build tinygo.riscv && !tkey
 
 package interrupt