disp: msm: dsi: call pll set rate directly instead of a function pointer cb

The clock framework nulls the clock hardware init data, after a variant
of clk_register is called on the clk_hw pointer.  This results in a null
pointer dereference when we try to call set rate in the PLL prepare
function. The call can be a direct call to the function rather than
trying to access through the init_data pointer of the clk_hw.

Change-Id: I3613eea915d4f5620d7f0258ae391ad2ac624148
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>

msm/dsi/dsi_pll_5nm.c

@@ -1391,7 +1391,7 @@ static int vco_5nm_prepare(struct clk_hw *hw)
 
 	if ((pll->vco_cached_rate != 0) &&
 	    (pll->vco_cached_rate == clk_hw_get_rate(hw))) {
-		rc = hw->init->ops->set_rate(hw, pll->vco_cached_rate,
+		rc = vco_5nm_set_rate(hw, pll->vco_cached_rate,
 				pll->vco_cached_rate);
 		if (rc) {
 			pr_err("pll(%d) set_rate failed, rc=%d\n",