core: Rename product variable Device_page_size_agnostic

The product variable Device_page_size_agnostic will be
renamed to DevicePageSizeAgnostic.

Test: source build/envsetup.sh
      lunch aosp_cf_arm64_phone_pgagnostic
      m
Bug: 289419664
Change-Id: I4c0026a559ca3d848ccad285a5516a56d01c0efb
diff --git a/core/soong_config.mk b/core/soong_config.mk
index bd6cfbb..e514475 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -151,7 +151,7 @@
 $(call add_json_bool, Malloc_pattern_fill_contents,      $(MALLOC_PATTERN_FILL_CONTENTS))
 $(call add_json_str,  Override_rs_driver,                $(OVERRIDE_RS_DRIVER))
 $(call add_json_str,  DeviceMaxPageSizeSupported,        $(TARGET_MAX_PAGE_SIZE_SUPPORTED))
-$(call add_json_bool, Device_page_size_agnostic,         $(filter true,$(TARGET_PAGE_SIZE_AGNOSTIC)))
+$(call add_json_bool, DevicePageSizeAgnostic,            $(filter true,$(TARGET_PAGE_SIZE_AGNOSTIC)))
 
 $(call add_json_bool, UncompressPrivAppDex,              $(call invert_bool,$(filter true,$(DONT_UNCOMPRESS_PRIV_APPS_DEXS))))
 $(call add_json_list, ModulesLoadedByPrivilegedModules,  $(PRODUCT_LOADED_BY_PRIVILEGED_MODULES))