build: secure_storage: Simplify stable AIDL configuration

Use the `MODULE_AIDL_STABLE` flag to let `aidl.mk` handle the
inclusion of the version for stable AIDL. This removes redundant,
manual configuration from the makefile.

Bug: 422909986
Test: atest vts_treble_vintf_trusted_hal_test
Change-Id: Iaaec78748dc8069e014cc58206136de4817a1345
1 file changed