clk: nomadik: correct struct name kernel-doc warning

Use the correct struct name for the kernel-doc notation to prevent
a kernel-doc warning:

clk-nomadik.c:148: warning: expecting prototype for struct clk_pll1. Prototype was for struct clk_pll instead

Fixes: ef6eb322ce ("clk: nomadik: implement the Nomadik clocks properly")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: linux-clk@vger.kernel.org
Link: https://lore.kernel.org/r/20221209002016.14776-1-rdunlap@infradead.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/clk-nomadik.c

@@ -138,7 +138,7 @@ out_put:
 }
 
 /**
- * struct clk_pll1 - Nomadik PLL1 clock
+ * struct clk_pll - Nomadik PLL clock
  * @hw: corresponding clock hardware entry
  * @id: PLL instance: 1 or 2
  */