clk: msm: clock-cpu-8953: Remove support of boost and Vmin

Boost feature removed as support is not required and the below commits are
reverted to remove the feature.
- 'commit 983d4352 ("clk: msm: clock-cpu-8953: Add DT property to
enable boost")'.
- 'commit 7e9c36a7 ("clk: msm: clock-cpu: Add support for hardware
boost and vmin")'.

Signed-off-by: Taniya Das <tdas@codeaurora.org>
Change-Id: I972c173dc92a91f5019e357aefb67942db2286fc