clk: rockchip: rk3568: Fix PLL rate setting for 78.75MHz

PLL rate on RK356x is calculated through the simple formula:
((24000000 / _refdiv) * _fbdiv) / (_postdiv1 * _postdiv2)

The PLL rate setting for 78.75MHz seems to be copied from 96MHz
so this patch fixes it and configures it properly.

Signed-off-by: Alibek Omarov <a1ba.omarov@gmail.com>
Fixes: 842f4cb ("clk: rockchip: Add more PLL rates for rk3568")
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20230614134750.1056293-1-a1ba.omarov@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: a1batross

drivers/clk/rockchip/clk-rk3568.c

@@ -82,7 +82,7 @@ static struct rockchip_pll_rate_table rk3568_pll_rates[] = {
 	RK3036_PLL_RATE(101000000, 1, 101, 6, 4, 1, 0),
 	RK3036_PLL_RATE(100000000, 1, 150, 6, 6, 1, 0),
 	RK3036_PLL_RATE(96000000, 1, 96, 6, 4, 1, 0),
-	RK3036_PLL_RATE(78750000, 1, 96, 6, 4, 1, 0),
+	RK3036_PLL_RATE(78750000, 4, 315, 6, 4, 1, 0),
 	RK3036_PLL_RATE(74250000, 2, 99, 4, 4, 1, 0),
 	{ /* sentinel */ },
 };