tamsui: fix derp
derpiness level definitely increased
supposed to be implented here: https://github.com/joebonrichie/android_kernel_sony_msm7x27a/commit/518f177631412234cdf61fe5e0793d2da836e2b5

Change-Id: I1324d9676d90ceebc00d4c360d9820673ac501b0