Enable scs for riscv64

https://github.com/google/android-riscv64/issues/106

Bug: b/277909695

Change-Id: I2ea0d41fd9dc43b3fefb748d10694917034ab586

cc/sanitize.go

@@ -646,10 +646,6 @@ func (sanitize *sanitize) begin(ctx BaseModuleContext) {
 	if (ctx.Arch().ArchType != android.Arm64 && ctx.Arch().ArchType != android.Riscv64) || !ctx.toolchain().Bionic() {
 		s.Scs = nil
 	}
-	// ...but temporarily globally disabled on riscv64 (http://b/277909695).
-	if ctx.Arch().ArchType == android.Riscv64 {
-		s.Scs = nil
-	}
 
 	// Memtag_heap is only implemented on AArch64.
 	// Memtag ABI is Android specific for now, so disable for host.