Increase lowest GPU step for 1400MHz devices

Devices using the 1400MHz Exynos 4210 are using 1280*800 screens. This
is a much bigger resolution than the Galaxy S2. 100MHz as the lowest GPU
step is too low for these devices, resulting in lag. Bump it up to
134MHz.

Change-Id: Ifd08cdc2e263695232d034890e54585f122453ff