msm: mdss: dsi: Add chromaticity values for HDR support

Add WRGB chromaticity values, peak brightness and blackness
level to panel information. This change also adds method to
parse afore mentioned parameters from device tree and exposes
this properties on sysfs node to read.

CRs-Fixed: 1095347
Change-Id: I039732d8c2a5fa98233647928283df8d9d3f3123
Signed-off-by: Shashank Babu Chinta Venkata <sbchin@codeaurora.org>