clk: msm: mdss: fix 32 bit compilation issues

Fix 32bit compilation issues in DSI and HDMI pll driver.
Also avoid udelay of more than 2ms as it gives a fake
__bad_udelay reference at link-time on 32bit build.

Change-Id: I2681c0fb2a7d69ee8a3f9f6d18164c3cb482d2f7
Signed-off-by: Vishnuvardhan Prodduturi <vproddut@codeaurora.org>
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>