boot: boot_serial: change logging to debug level

Update the log level for RX and TX messages from INFO to DEBUG to reduce
clutter in the serial interface logs. This change helps in keeping the
output cleaner and focuses on more critical information by default.

Signed-off-by: Hudson C. Dalpra <hudson@bduncanltd.com>

boot/boot_serial/src/boot_serial.c

@@ -611,7 +611,7 @@ static off_t erase_range(const struct flash_area *fap, off_t start, off_t end)
     }
 
     size = flash_sector_get_off(&sect) + flash_sector_get_size(&sect) - start;
-    BOOT_LOG_INF("Erasing range 0x%jx:0x%jx", (intmax_t)start,
+    BOOT_LOG_DBG("Erasing range 0x%jx:0x%jx", (intmax_t)start,
 		 (intmax_t)(start + size - 1));
 
     rc = flash_area_erase(fap, start, size);
@@ -796,7 +796,7 @@ bs_upload(char *buf, int len)
         rem_bytes = 0;
     }
 
-    BOOT_LOG_INF("Writing at 0x%x until 0x%x", curr_off, curr_off + img_chunk_len);
+    BOOT_LOG_DBG("Writing at 0x%x until 0x%x", curr_off, curr_off + img_chunk_len);
     /* Write flash aligned chunk, note that img_chunk_len now holds aligned length */
 #if defined(MCUBOOT_SERIAL_UNALIGNED_BUFFER_SIZE) && MCUBOOT_SERIAL_UNALIGNED_BUFFER_SIZE > 0
     if (flash_area_align(fap) > 1 &&
@@ -870,7 +870,7 @@ bs_upload(char *buf, int len)
     }
 
 out:
-    BOOT_LOG_INF("RX: 0x%x", rc);
+    BOOT_LOG_DBG("RX: 0x%x", rc);
     zcbor_map_start_encode(cbor_state, 10);
     zcbor_tstr_put_lit_cast(cbor_state, "rc");
     zcbor_int32_put(cbor_state, rc);
@@ -1124,7 +1124,7 @@ boot_serial_output(void)
         boot_uf->write("\n", 1);
     }
 
-    BOOT_LOG_INF("TX");
+    BOOT_LOG_DBG("TX");
 }
 
 /*