drm/msm/hdmi: drop pll_cmp_to_fdata from hdmi_phy_8998

The pll_cmp_to_fdata() was never used by the working code. Drop it to
prevent warnings with W=1 and clang.

Reported-by: Jani Nikula <jani.nikula@intel.com>
Closes: https://lore.kernel.org/dri-devel/3553b1db35665e6ff08592e35eb438a574d1ad65.1725962479.git.jani.nikula@intel.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Fixes: caedbf1 ("drm/msm: add msm8998 hdmi phy/pll support")
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/615348/
Link: https://lore.kernel.org/r/20240922-msm-drop-unused-func-v1-1-c5dc083415b8@linaro.org
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>

Author: lumag

drivers/gpu/drm/msm/hdmi/hdmi_phy_8998.c

@@ -153,15 +153,6 @@ static inline u32 pll_get_pll_cmp(u64 fdata, unsigned long ref_clk)
 	return dividend - 1;
 }
 
-static inline u64 pll_cmp_to_fdata(u32 pll_cmp, unsigned long ref_clk)
-{
-	u64 fdata = ((u64)pll_cmp) * ref_clk * 10;
-
-	do_div(fdata, HDMI_PLL_CMP_CNT);
-
-	return fdata;
-}
-
 #define HDMI_REF_CLOCK_HZ ((u64)19200000)
 #define HDMI_MHZ_TO_HZ ((u64)1000000)
 static int pll_get_post_div(struct hdmi_8998_post_divider *pd, u64 bclk)