LF-95-1 arm64: imx8qm-ss-lvds.dtsi: Correct LVDS region address and size

LF-95-1 arm64: imx8qm-ss-lvds.dtsi: Correct LVDS region address and size

The LVDS region is the CSR(Control Status Registers) space.
The spec tells us that the CSR start address is 0x1000 and end address
is 0x1FFF according to the subsystem start address.  However, it turns
out some space are inaccessible, which would accidently cause system
hang via kernel regmap debugfs.  This patch corrects the LVDS region
start address and chooses a sensible size, which makes sure all exposed
registers are accessible.

Reviewed-by: Sandor Yu <Sandor.yu@nxp.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>