sm6375-common: Introduce a stub blair-post-boot script

This will be used to tune some parameters in the device. Only run
this script after proprietary kernel post-boot has run, so that
these changes are not overriden by the same.

Change-Id: Ibcef27a2813870c62d54c9d762eae9e03da677ad
Signed-off-by: Vaisakh Murali <mvaisakh@statixos.com>

rootdir/bin/init.blair.post_boot.sh

@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2023 StatiXOS
+# SPDX-License-Identifier: Apache-2.0
+#
+
+# Custom tuning for Blair SoC
+

rootdir/etc/init/hw/init.target.rc

@@ -162,3 +162,13 @@ on property:init.svc.vendor.per_mgr=running
 
 on property:sys.shutdown.requested=*
     stop vendor.per_proxy
+
+service blair-post-boot /vendor/bin/sh /vendor/bin/init.blair.post_boot.sh
+    class late_start
+    user root
+    group root system wakelock graphics
+    disabled
+    oneshot
+
+on property:vendor.post_boot.parsed=1
+    start blair-post-boot