drivers/misc: Move conditional compilation to Makefile

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/BAB7xx.h b/include/configs/BAB7xx.h
index 8ec70aa..799ce38 100644
--- a/include/configs/BAB7xx.h
+++ b/include/configs/BAB7xx.h
@@ -346,7 +346,7 @@
 /*
  * NS87308 Configuration
  */
-#define CFG_NS87308                    /* Nat Semi super-io cntr on ISA bus */
+#define CONFIG_NS87308                    /* Nat Semi super-io cntr on ISA bus */
 #define CFG_NS87308_BADDR_10    1
 #define CFG_NS87308_DEVS        (CFG_NS87308_UART1   | \
 				 CFG_NS87308_UART2   | \