Add sepolicy for RamdumpService to access property sys.boot.reason on B1C1

Denied pattern is:
avc: denied { read } for name="u:object_r:system_boot_reason_prop:s0" dev="tmpfs" ino=21223 scontext=u:r:ramdump_app:s0:c206,c256,c512,c768 tcontext=u:object_r:system_boot_reason_prop:s0 tclass=file permissive=0

Bug: 132220248

Test: Manually, local run pass. RamdumpService can access the property.
Change-Id: I5e67fb40404a8e8fa4c14438815285289948ebb7
diff --git a/vendor/qcom/common/ramdump_app.te b/vendor/qcom/common/ramdump_app.te
index b511c3b..49d15dc 100644
--- a/vendor/qcom/common/ramdump_app.te
+++ b/vendor/qcom/common/ramdump_app.te
@@ -12,4 +12,5 @@
 
   set_prop(ramdump_app, vendor_ramdump_prop);
   get_prop(system_app, vendor_ssr_prop)
+  get_prop(ramdump_app, system_boot_reason_prop)
 ')