rockchip: clk: rk3188: update dpll settings to make EMAC work

The patch set dpll settings for 300MHz to values used by binary
blob[1]. With new values dpll still generate 300MHz clock, but
EMAC work. Probably with new values dpll generate more stable clock.

dpll on rk3188 provide clocks to DDR and EMAC. With current
dpll settings EMAC doesn't work on radxa rock. EMAC sends packets
to network, but it doesn't receive anything. ifconfig shows a lot
of framing errors.

[1] https://github.com/linux-rockchip/u-boot-rockchip/blob/u-boot-rk3288/
    tools/rk_tools/3188_LPDDR2_300MHz_DDR3_300MHz_20130830.bin

Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/clk/rockchip/clk_rk3188.c

@@ -123,7 +123,7 @@ static int rkclk_configure_ddr(struct rk3188_cru *cru, struct rk3188_grf *grf,
 			       unsigned int hz, bool has_bwadj)
 {
 	static const struct pll_div dpll_cfg[] = {
-		{.nf = 25, .nr = 2, .no = 1},
+		{.nf = 75, .nr = 1, .no = 6},
 		{.nf = 400, .nr = 9, .no = 2},
 		{.nf = 500, .nr = 9, .no = 2},
 		{.nf = 100, .nr = 3, .no = 1},