[sw] Fix dependency to build coverage

Signed-off-by: Philipp Wagner <phw@lowrisc.org>

sw/device/lib/testing/meson.build

diff --git a/sw/device/lib/testing/meson.build b/sw/device/lib/testing/meson.build
index af9765c..30983f9 100644
--- a/sw/device/lib/testing/meson.build
+++ b/sw/device/lib/testing/meson.build
@@ -36,7 +36,7 @@
       ],
       dependencies: [
         sw_lib_mem,
-        sw_lib_uart,
+        sw_lib_dif_uart,
         sw_lib_runtime_log,
       ],
     ),