Use SHA-256 for hashing BoringSSL crypto module.

Reason: Performs significantley better than SHA-512
on ARM64 devices

Bug: 141710485
Test: flashall
Change-Id: I40f0873d3e705a75b9a7a3ba1445a9176afff77b

cc/library.go

@@ -1333,6 +1333,7 @@ func maybeInjectBoringSSLHash(ctx android.ModuleContext, outputFile android.Modu
 		rule := android.NewRuleBuilder()
 		rule.Command().
 			BuiltTool(ctx, "bssl_inject_hash").
+			Flag("-sha256").
 			FlagWithInput("-in-object ", outputFile).
 			FlagWithOutput("-o ", hashedOutputfile)
 		rule.Build(pctx, ctx, "injectCryptoHash", "inject crypto hash")