riscv64 has no "other" to need an sepolicy.

Fixes
```
out/soong/installs-aosp_riscv64.mk:56833: error: overriding commands for target `out/target/product/generic_riscv64/system/etc/seccomp_policy/crash_dump.riscv64.policy', previously defined at out/soong/installs-aosp_riscv64.mk:56829
```

Test: m
Change-Id: I78a1c6b10dac2da704515f33b492ff37cc086dd6
diff --git a/debuggerd/Android.bp b/debuggerd/Android.bp
index 1e9fd7b..1be69c3 100644
--- a/debuggerd/Android.bp
+++ b/debuggerd/Android.bp
@@ -490,9 +490,6 @@
         arm64: {
             src: "seccomp_policy/crash_dump.arm.policy",
         },
-        riscv64: {
-            src: "seccomp_policy/crash_dump.riscv64.policy",
-        },
         x86: {
             src: "seccomp_policy/crash_dump.x86_64.policy",
         },