common: Drop log.h from common header

Move this header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
index 5029c71..07600c5 100644
--- a/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
+++ b/drivers/i2c/muxes/i2c-arb-gpio-challenge.c
@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <errno.h>
 #include <i2c.h>
+#include <log.h>
 #include <malloc.h>
 #include <asm/gpio.h>