msm_fb: Verizon/HTC compatible version of set_overlay ioctl

This ignores the sharpness setting that could be passed as an
option to the frame buffer.  As far as I can tell, the sharpness
is not used by the HTC display driver.
Merge pull request #6 from crpalmer/cm-10.1-overlay

msm_fb: Verizon/HTC compatible version of set_overlay ioctl