Set LOCAL_SDK_VERSION := current for RROs

For sanity, and to silence the error of not setting
PRIVATE_PLATFORM_APIS or LOCAL_SDK_VERSION.

Exempt framework-res from this, as it can't build against the SDK.
Also tweak the previous whitelisting to be more specifically for
framework-res.

Bug: 118823052
Test: make downstream products
Change-Id: Ia15aaa3b1ea95e02e3483673b668ed2cbca76ba9