clk: sunxi: a20-gmac: fix kernel-doc warnings

Move the function kernel-doc comment to be immediately before the
function implementation, then add a function parameter description
to prevent kernel-doc warnings:

clk-a20-gmac.c:43: warning: expecting prototype for sun7i_a20_gmac_clk_setup(). Prototype was for SUN7I_A20_GMAC_GPIT() instead
clk-a20-gmac.c:53: warning: Function parameter or struct member 'node' not described in 'sun7i_a20_gmac_clk_setup'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Emilio López <emilio@elopez.com.ar>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc:  <linux-clk@vger.kernel.org>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Samuel Holland <samuel@sholland.org>
Cc:  <linux-arm-kernel@lists.infradead.org>
Cc:  <linux-sunxi@lists.linux.dev>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20240121051837.17564-1-rdunlap@infradead.org
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Author: rddunlap

drivers/clk/sunxi/clk-a20-gmac.c

@@ -15,8 +15,19 @@
 
 static DEFINE_SPINLOCK(gmac_lock);
 
+
+#define SUN7I_A20_GMAC_GPIT	2
+#define SUN7I_A20_GMAC_MASK	0x3
+#define SUN7I_A20_GMAC_PARENTS	2
+
+static u32 sun7i_a20_gmac_mux_table[SUN7I_A20_GMAC_PARENTS] = {
+	0x00, /* Select mii_phy_tx_clk */
+	0x02, /* Select gmac_int_tx_clk */
+};
+
 /**
  * sun7i_a20_gmac_clk_setup - Setup function for A20/A31 GMAC clock module
+ * @node: &struct device_node for the clock
  *
  * This clock looks something like this
  *                               ________________________
@@ -39,16 +50,6 @@ static DEFINE_SPINLOCK(gmac_lock);
  * enable/disable this clock to configure the required state. The clock
  * driver then responds by auto-reparenting the clock.
  */
-
-#define SUN7I_A20_GMAC_GPIT	2
-#define SUN7I_A20_GMAC_MASK	0x3
-#define SUN7I_A20_GMAC_PARENTS	2
-
-static u32 sun7i_a20_gmac_mux_table[SUN7I_A20_GMAC_PARENTS] = {
-	0x00, /* Select mii_phy_tx_clk */
-	0x02, /* Select gmac_int_tx_clk */
-};
-
 static void __init sun7i_a20_gmac_clk_setup(struct device_node *node)
 {
 	struct clk *clk;