earlgrey: Fix uart test failures

Our test tooling expects to see `PASS` or `FAIL` on the console.  The
uart test was emitting `PASSED` or `FAILED`.

Signed-off-by: Chris Frantz <cfrantz@google.com>

target/earlgrey/tests/uart/test_uart.rs

diff --git a/target/earlgrey/tests/uart/test_uart.rs b/target/earlgrey/tests/uart/test_uart.rs
index 6e43d5f..2333700 100644
--- a/target/earlgrey/tests/uart/test_uart.rs
+++ b/target/earlgrey/tests/uart/test_uart.rs
@@ -65,9 +65,9 @@
     let ret = test_uart_interrupts();
 
     if ret.is_err() {
-        pw_log::error!("❌ FAILED: {}", ret.status_code() as u32);
+        pw_log::error!("❌ FAIL: {}", ret.status_code() as u32);
     } else {
-        pw_log::info!("✅ PASSED");
+        pw_log::info!("✅ PASS");
     }
 
     ret