vivo: Always return -EPERM in detect panel because VIVO uses MDDI panels.
vivo: Remove board header functions definitions that are not being used yet.
These will be added back when they are put into use. This way, it will be possible to know which ones are actually being used.
vivo: Remove second definition of VIVO_GPIO_KEYPAD_POWER_KEY.
vivo: Configure GPIO 46 for VIVO Power Key.