common: Drop linux/printk.h from common header

This old patch was marked as deferred. Bring it back to life, to continue
towards the removal of common.h

Move this out of the common header and include it only where needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/adc/sandbox.c b/drivers/adc/sandbox.c
index 6e43546..43cad34 100644
--- a/drivers/adc/sandbox.c
+++ b/drivers/adc/sandbox.c
@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <adc.h>
 #include <sandbox-adc.h>
+#include <linux/printk.h>
 
 /**
  * struct sandbox_adc_priv - sandbox ADC device's operation status and data