video: rockchip: hdmi: v2: get phy register setting from dts

video: rockchip: hdmi: v2: get phy register setting from dts

We can configurate phy setting in dts node "rockchip,phy_table"
with following format:

<maxfreq pre-emphasis slopeboost clklevel data0level data1level data2level>

Phy setting table must list from low freq to high freq and cover
all supported frequency, for example:

&hdmi {
	status = "okay";
	rockchip,phy_table =
		<165000000 0 0 17 17 17 17>,
		<340000000 0 0 14 17 17 17>,
		<594000000 0 0 9 17 17 17>;
};

If dts node is not exist, we use default setting defined in code.

Change-Id: I06731419057a2a8cf4d210bf566b1206edc39ea1
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>