Pass build_datetime_file to soong partitions

The build_datetime_file can be used to create hermetic image files, and
will be used to validate mk->soong partition migration.

Bug: 383357338
Test: lunch aosp_cf_x86_64_phone-trunk_staging-userdebug
Setup
- export BUILD_DATETIME=10
- commented out installed_*_notice_xml_gz in build/make/core/Makefile
Test: verified that the following .img files are bit identical
odm,system_dlkm,vendor_dlkm,odm_dlkm

Change-Id: I254cd3f1afbd26439dd70505c7135d834ec234bc