lk: msm: scm: Add save-partition-hash

Add new command to allow saving the kernel image sha256 digest.

Change-Id: Ic73199cf38886cecb5119d534f2390ab50cc9d5f
diff --git a/platform/msm_shared/include/scm.h b/platform/msm_shared/include/scm.h
index a565b2f..b2ae7a9 100644
--- a/platform/msm_shared/include/scm.h
+++ b/platform/msm_shared/include/scm.h
@@ -171,6 +171,9 @@
 #define SCM_SVC_CE_CHN_SWITCH_ID    0x04
 #define SCM_CE_CHN_SWITCH_ID        0x02
 
+#define SCM_SVC_ES                      0x10
+#define SCM_SAVE_PARTITION_HASH_ID      0x01
+
 enum ap_ce_channel_type {
 AP_CE_REGISTER_USE = 0,
 AP_CE_ADM_USE = 1