msm: mdss: hdmi: remove phy programming from tx driver

PHY/PLL programming are handled by PHY/PLL driver. Remove any
programming done for PHY/PLL in HDMI Tx core driver.

Change-Id: I2d3a9311d7dc011b292a9fdfcb1424dbb435aedc
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>