target/platform: msmzirc: Fix for emmc support

Enable property for voltage switch from 3.3 to 1.8 and initialize
the boot device required for selecting right device tree.

Change-Id: I817215e395ba9dfe5c119a5f7e04542193b4b861
diff --git a/platform/msmzirc/platform.c b/platform/msmzirc/platform.c
index 96b5dc5..7b9c115 100644
--- a/platform/msmzirc/platform.c
+++ b/platform/msmzirc/platform.c
@@ -76,6 +76,9 @@
 
 void platform_early_init(void)
 {
+	/* Read boot config for identifying boot device */
+	platform_read_boot_config();
+
 	/* Initialize board identifier data */
 	board_init();