Revert "defconfig: enable kernel level CPU throttling"

This reverts commit 55ffe3ed7fce12d2bf1c6e502dfd7f1564b03659.

Change-Id: I01a1107175e07d827f28b4ba0f8700d88026abf4
Merge "Revert "defconfig: enable kernel level CPU throttling"" into android-4.4
updated default cpu freq to 2457000

Change-Id: I2b7e3758275e1a1d7292ec1f4a75dc725c17bc02