[CP] Update README of uAPI HDCP

Add TGL platform support in README

[Internal]
Platforms: Gen12
OS: Linux
Feature impact: HDCP
Resolves: VSMGWL-23386
Related-to: VSMGWL-23386
Klocwork: PASS
IP Scan: PASS

Change-Id: I40adcd8be7bcd927f7a659aa182a0b57aea062b9

Author: shiqiangyu

README.md

@@ -86,6 +86,8 @@ KBL (Kabylake)      for HDCP1.4 and HDCP2.2
 
 GLK (Geminilake)    for HDCP1.4 and HDCP2.2
 
+TGL (Tigerlake)     for HDCP1.4 and HDCP2.2
+
 
 ## Known Issues and Limitations