ARM: imx8m: fix imx_eqos_txclk_set_rate() type mismatch for LTO

When building imx8mp_evk_defconfig with LTO, the compiler complains
about type mismatch of function imx_eqos_txclk_set_rate() in file
  drivers/net/dwc_eth_qos.c:845:12
which contains a weak definition of this function, vs file
  arch/arm/mach-imx/imx8m/clock_imx8mm.c
which contains an implementation.

Change the type of this function in the implementation to fix this.
Signed-off-by: NMarek Behún <marek.behun@nic.cz>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

arch/arm/mach-imx/imx8m/clock_imx8mm.c

@@ -846,7 +846,7 @@ int set_clk_eqos(enum enet_freq type)
 	return 0;
 }
 
-int imx_eqos_txclk_set_rate(u32 rate)
+int imx_eqos_txclk_set_rate(ulong rate)
 {
 	u32 val;
 	u32 eqos_post_div;