Update sdk parent

sdk.mk used to be a synonym for sdk_phone_armv7, but isn't anymore.
Update sample_addon to inherit directly from sdk_phone_armv7 instead.

Bug: 205008975
Test: presubmit
Merged-In: I926d520cec73ac54f4c9da75d9dcc67f2edc7db1
Change-Id: I926d520cec73ac54f4c9da75d9dcc67f2edc7db1
1 file changed