Add TARGET_QCOM_MEDIA_VARIANT flag

Although this flag does not directly enable building qcom_media-legacy, it allows libstagefright and possibly other android packages to include the correct qcom headers.

Change-Id: Ib3b7c4836be191a177d31218d291ec88b25218f4
Clean up flags

Change-Id: Iaa66cd431da4be97f3e8cd70b0029167f78b6f43
Revert "Use cortex-a8 instruction set until scorpion is sorted out in bionic"

This reverts commit 931ede11cf8f41549515cfd4689843250831cd26.