readme: Update for latest trusted-firmware-m sync to TF-Mv1.2.0

Fixup SHAs, for trusted-firmware-m and tf-m-tests repositories,
to account for synchronizing TF-M module to upstream TF-M v1.2.0
release. Also update init-git.sh.

Signed-off-by: Ioannis Glaropoulos <[email protected]>

Author: ioannisg

README.rst

@@ -14,13 +14,13 @@ This module in Zephyr has included TF-M and it's dependencies, they are:
 
 TF-M:
     repo: https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git
-    tag: TF-Mv1.2-RC2
-    commit: 368a25ff5e4925eed532fe7f6d03c3be9d8c4062
+    tag: TF-Mv1.2.0
+    commit: c78be620c0fee08888956646b8f02fd03ab88567
     BSD-3-Clause
 
 TF-M Tests:
     repo: https://git.trustedfirmware.org/TF-M/tf-m-tests.git
-    tag: TF-Mv1.2-RC2
+    tag: TF-Mv1.2.0
     commit: ccda809801e529250b47c9ac470cf94daef1bb1b
     license: Apache 2.0
 

init-git.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
-TFM_GIT_SHA=368a25ff5e4925eed532fe7f6d03c3be9d8c4062
-TFM_TESTS_GIT_SHA=ccda809801e529250b47c9ac470cf94daef1bb1b
+TFM_GIT_SHA=TF-Mv1.2.0
+TFM_TESTS_GIT_SHA=TF-Mv1.2.0
 MCUBOOT_GIT_SHA=v1.6.0
 PSA_ARCH_TESTS_GIT_SHA=v20.03_API1.0