cros_ec: Move #ifdef to permit flash region access

Flash region access is not tied to having commands, so adjust the #ifdef
to reflect this.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c
index f95bfe7..1cb879c 100644
--- a/drivers/misc/cros_ec.c
+++ b/drivers/misc/cros_ec.c
@@ -932,7 +932,6 @@
 	return 0;
 }
 
-#ifdef CONFIG_CMD_CROS_EC
 int cros_ec_decode_region(int argc, char * const argv[])
 {
 	if (argc > 0) {
@@ -999,6 +998,8 @@
 	return 0;
 }
 
+#ifdef CONFIG_CMD_CROS_EC
+
 /**
  * Perform a flash read or write command
  *