clk: imx8mm: Fix typo of pwm3 clock's mux option #4

i.MX8MM has no sys3_pll2_out clock, PWM3 clock's mux option #4
should be sys_pll3_out, sys3_pll2_out is a typo, fix it.

Fixes: ba5625c3 ("clk: imx: Add clock driver support for imx8mm")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/clk/imx/clk-imx8mm.c

@@ -287,7 +287,7 @@ static const char *imx8mm_pwm2_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_1
 					 "sys_pll3_out", "clk_ext1", "sys_pll1_80m", "video_pll1_out", };
 
 static const char *imx8mm_pwm3_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_160m", "sys_pll1_40m",
-					 "sys3_pll2_out", "clk_ext2", "sys_pll1_80m", "video_pll1_out", };
+					 "sys_pll3_out", "clk_ext2", "sys_pll1_80m", "video_pll1_out", };
 
 static const char *imx8mm_pwm4_sels[] = {"osc_24m", "sys_pll2_100m", "sys_pll1_160m", "sys_pll1_40m",
 					 "sys_pll3_out", "clk_ext2", "sys_pll1_80m", "video_pll1_out", };