Since the last post on the eMMC pinout, I found the other two important test points. First is VCCQ, which is the power to the eMMC controller. It needs to be pulled at 1.8V. The other point is VCC, which is the power to the actual NAND flash. It needs to be pulled at 3.3V.
Found on the bottom of the board, above the SoC
Found on the bottom of the board, near the multi-connector
For reference, the pad of the removed eMMC on the second Vita