display: dts modify [1/1]

display: dts modify [1/1]

PD#TV-405

Problem:
Should create a 720p ui display mode on p321.

Solution:
Created a folder named t962_p321_720p under device/amlogic
and modified some variate.
The diffs that compare with txl_t962_p321.dts
amlogic-dt-id = "txl_p321_v1_720p";
	size = <0x400000>;
	alloc-ranges = <0x3fc00000 0x400000>;
	mem_size = <0x00400000 0x00b00000 0x00100000>;
	/* uboot logo,fb0/fb1 memory size,if afbcd fb0=0x0b51000*/
	display_mode_default = "720p60hz";
	/*1280*720*4*3 = 0xA8C000*/
	display_size_default = <1280 720 1280 2160 32>;
	logo_addr = "0x3fc00000";

Verify:
p321

Change-Id: Ia397cd6cbcf4fdd9fb139259099805bdad90b92f
Signed-off-by: Guotai Shen <guotai.shen@amlogic.com>