clk: msm: clock-cpu-8996: Remove primary PLL workaround on MSM8996V3

Test-control register programming across frequency changes
are no longer necessary on V3. Remove the workaround.

Change-Id: I2ce539c1e227cc143614a8b52348c8f22045fa0b
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>