Add TOT_SEPOLICY_VERSION = 10000.0

This variable is equal to the sepolicy version for tip-of-tree development.

Bug: 74622750
Test: ./build/soong/soong_ui.bash  --dumpvars-mode -vars PLATFORM_SEPOLICY_VERSION
is unchanged.
Change-Id: I2a62f7399fe245ec0c681e9a789da6b1b83dd9d8
Merged-In: I2a62f7399fe245ec0c681e9a789da6b1b83dd9d8
(cherry picked from commit d9c8e956)