Add system property ro.product.page_size

When target sets TARGET_BOOTS_16K, it should boot
with 16KB page size. Adding system property based on TARGET_BOOTS_16K.

Test: m Vts16KPageSizeTest && atest -c Vts16KPageSizeTest
Flag: TEST_ONLY
Bug: 350993987
Change-Id: I2fe9ce657381310879a082c93dd64019d6bae8c3
diff --git a/private/property_contexts b/private/property_contexts
index 601dc99..bc53f25 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -1022,6 +1022,9 @@
 # Property for enabling 16k pages developer option.
 ro.product.build.16k_page.enabled u:object_r:enable_16k_pages_prop:s0 exact bool
 
+# Property that indicates which page size the device boots by default.
+ro.product.page_size u:object_r:page_size_prop:s0 exact int
+
 ro.debuggable       u:object_r:userdebug_or_eng_prop:s0 exact bool
 ro.force.debuggable u:object_r:build_prop:s0 exact bool