rockchip: rk3288-tinker: Only include required DT nodes in TPL

rockchip: rk3288-tinker: Only include required DT nodes in TPL

Drop the unneeded bootph-all prop from dmc node, it is already defined
in soc u-boot.dtsi.

Remove booth-all prop from gpio7 node, this node is not needed in TPL.

Adjust bootph props to include pinctrl related nodes for UART2.

Remove the explicit bootph-all prop from the pinctrl node, any bootph-
prop will automatically be propagated to the pinctrl node.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>