clk: analogbits: fix doc warning in wrpll-cln28hpc.c

Fix the following make W=1 warning:

  drivers/clk/analogbits/wrpll-cln28hpc.c:227: warning: expecting prototype for wrpll_configure(). Prototype was for wrpll_configure_for_rate() instead
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210601114154.3163327-1-yangyingliang@huawei.comSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/analogbits/wrpll-cln28hpc.c

@@ -198,7 +198,7 @@ static int __wrpll_update_parent_rate(struct wrpll_cfg *c,
 }
 
 /**
- * wrpll_configure() - compute PLL configuration for a target rate
+ * wrpll_configure_for_rate() - compute PLL configuration for a target rate
  * @c: ptr to a struct wrpll_cfg record to write into
  * @target_rate: target PLL output clock rate (post-Q-divider)
  * @parent_rate: PLL input refclk rate (pre-R-divider)