stub radio HAL: fix default antenna connected state for FM.

Bug: 33583729
Change-Id: Ifbd2c95ab34a8faa7d31f4a1b2f28c6d7df38766

Test: build and run broadcast radio VTS
diff --git a/modules/radio/radio_hw.c b/modules/radio/radio_hw.c
index a4db565..63646a4 100644
--- a/modules/radio/radio_hw.c
+++ b/modules/radio/radio_hw.c
@@ -47,7 +47,7 @@
     .bands = {
         {
             .type = RADIO_BAND_FM,
-            .antenna_connected = false,
+            .antenna_connected = true,
             .lower_limit = 87900,
             .upper_limit = 107900,
             .num_spacings = 1,