Add apexkey "com.android.hardware"

This can be shared by many AOSP com.android.hardware.* APEXes defined in
hardware/interfaces.

Bug: 296524155
Test: m
Change-Id: I8d5bf7d9cf8fe4b502af9240027529d61c9776af
diff --git a/apexkey/com.android.hardware.x509.pem b/apexkey/com.android.hardware.x509.pem
new file mode 100644
index 0000000..2728a23
--- /dev/null
+++ b/apexkey/com.android.hardware.x509.pem
@@ -0,0 +1,34 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----