exynos9820-common: Allow to access bootable/deprecated-ota targets

Exynos9820 is still using non-AB update.
non-AB code will be moved to a separated namespace, add
deprecated-ota to exynos9820-common namespace list ahead of time to avoid
breakage.

Test: th
Bug: 324360816
Change-Id: I909064be36e8febe80492cf010eb6eac3d6bc33d
1 file changed