common: Log should depends on DM not be selected by DM

Better use depends on instead of select.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/common/Kconfig b/common/Kconfig
index 9f6a162..4d7215a 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -430,7 +430,7 @@
 
 config LOG
 	bool "Enable logging support"
-	select DM
+	depends on DM
 	help
 	  This enables support for logging of status and debug messages. These
 	  can be displayed on the console, recorded in a memory buffer, or