ARM: highbank: compile misc_init_r only if CONFIG_MISC_INIT_R

Compile misc_init_r only if CONFIG_MISC_INIT_R is enabled.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
diff --git a/board/highbank/highbank.c b/board/highbank/highbank.c
index b224aae..b0c20fe 100644
--- a/board/highbank/highbank.c
+++ b/board/highbank/highbank.c
@@ -62,6 +62,7 @@
 	return rc;
 }
 
+#ifdef CONFIG_MISC_INIT_R
 int misc_init_r(void)
 {
 	char envbuffer[16];
@@ -83,6 +84,7 @@
 
 	return 0;
 }
+#endif
 
 int dram_init(void)
 {