MLECO-5410: Minor changes for LCD component

Allowing some minor customizations for LCD display by passing some
additional configuration parameters to the `lcd` component under HAL.

 - LCD title display can be turned ON/OFF (default is ON). CMake
   configuration parameter: `LCD_TITLE_EN`.
 - The title string itself can be changed. CMake configuration
   parameter: `LCD_TITLE_STRING`.

Additionally, at application level, ImageUtils.hpp now has some more
colours for background and text colours to choose from. These could
potentially be used to drive a "light" or "dark" theme.

Change-Id: Ia7c7b4f0e818ce02ba5bc94beac0da390efdf985
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>