cros_ec: Add an enum for the number of flash regions

Add an enum for the number of flash regions so we can keep track of all
the possible regions.

Reviewed-by: Randall Spangler <rspangler@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/ec_commands.h b/include/ec_commands.h
index 12811cc..d9c8c1f 100644
--- a/include/ec_commands.h
+++ b/include/ec_commands.h
@@ -536,7 +536,7 @@
 
 enum ec_flash_region {
 	/* Region which holds read-only EC image */
-	EC_FLASH_REGION_RO,
+	EC_FLASH_REGION_RO = 0,
 	/* Region which holds rewritable EC image */
 	EC_FLASH_REGION_RW,
 	/*
@@ -544,6 +544,8 @@
 	 * EC_FLASH_REGION_RO)
 	 */
 	EC_FLASH_REGION_WP_RO,
+	/* Number of regions */
+	EC_FLASH_REGION_COUNT,
 };
 
 struct ec_params_flash_region_info {