drivers: TS: ektf2k: replace msleep with usleep_range in reset path

When doing msleep([1...20]) we're likely sleeping for ~20ms.
Replacing with usleep_range will ensure it'll be ready earlier.
Merge pull request #74 from kholk/aosp/LNX.LA.3.5.2.2-03010-8x74.0

drivers: TS: ektf2k: replace msleep with usleep_range in reset path