add Spinel SPI interface support

This commit enables the Thread Network HAL to support the Spinel
SPI interface.

Bug: 277286756
Test: Build and run otbr-agent on the emulator.
Change-Id: I6726eead5686f0afb33e5e2035ebc9021eca5afa
diff --git a/threadnetwork/aidl/default/Android.bp b/threadnetwork/aidl/default/Android.bp
index 736e808..8b938d2 100644
--- a/threadnetwork/aidl/default/Android.bp
+++ b/threadnetwork/aidl/default/Android.bp
@@ -29,6 +29,7 @@
         "openthread-hdlc",
         "openthread-platform",
         "openthread-posix",
+        "openthread-spi",
         "openthread-url",
     ],
 
@@ -68,6 +69,7 @@
         "openthread-hdlc",
         "openthread-platform",
         "openthread-posix",
+        "openthread-spi",
         "openthread-url",
     ],