dev: gcdb: Do not hard code the DSI string length

Panel header file contains the DSI string "dsi:0:".
Length of this string is hard coded to MAX_DSI_STREAM_LEN
which is not correct. This string may change in future
so length of the string should be calculated dynamically.

Change-Id: Ifc9979eeb021690ed13e52bd256600ed8d159497
2 files changed