refactor(smccc): move pmf to vendor el3 calls

Move pmf support to vendor-specific EL3 Monitor Service Calls. Remove
pmf call count as it's not supported in vendor-specific el3 as per
SMCCC Documentation 1.5:
https://developer.arm.com/documentation/den0028/latest

Add a deprecation notice to inform PMF is moved from arm-sip range to
vendor-specific EL3 range. PMF support from arm-sip range will be
removed and will not available after TF-A 2.12 release.

Change-Id: Ie1e14aa601d4fc3db352cd5621d842017a18e9ec
Signed-off-by: Govindraj Raja <govindraj.raja@arm.com>
diff --git a/include/services/ven_el3_svc.h b/include/services/ven_el3_svc.h
index 5974a2b..e030b68 100644
--- a/include/services/ven_el3_svc.h
+++ b/include/services/ven_el3_svc.h
@@ -26,4 +26,7 @@
 /* DEBUGFS_SMC_32		0x87000010U */
 /* DEBUGFS_SMC_64		0xC7000010U */
 
+/* PMF_SMC_GET_TIMESTAMP_32	0x87000020U */
+/* PMF_SMC_GET_TIMESTAMP_64	0xC7000020U */
+
 #endif /* VEN_EL3_SVC_H */