Revert "CHROMIUM: ARM: Implement udelay using ndelay"

This reverts commit 127bfec9fdad4839a32878e88f525dcc2d0bc643.
Revert "CHROMIUM: ARM: delay: Implement ndelay using UMULL"

This reverts commit 040e92c355501c49673103eccbd9100f3bdaa4ae.