pyramid: display: Move regulator initialization to mipi driver

Signed-off-by: Sultanxda <sultanxda@gmail.com>
pyramid: mipi: Create sysfs panel voltage control

Could probably be prettier, but this is only meant to be written to by my Aroma installer. Panel voltage can be changed on-the-go via the sysfs file /sys/module/msm_mipi/parameters/panel_uv, where panel_uv is a value in mV to undervolt the panel by (stock panel voltage is 3100mV). After the sysfs control is written with the desired undervolt value (as a multiple of 25mV), turn the screen off and on to apply the new voltage.

Signed-off-by: Sultanxda <sultanxda@gmail.com>
pyramid: Increase ION MM & WB size by 5MB
sultan_defconfig: r52