common: convert compulab splash load code to common code

common: convert compulab splash load code to common code

Move board/compulab/common/splash.c code to
common/splash_source.c to make it available for everybody. This move
renames cl_splash_screen_prepare() to splash_source_load(), and
the compilation of this code is conditional on CONFIG_SPLASH_SOURCE.

splash_source features:
* Provide a standardized way for declaring board specific splash screen
  locations
* Provide existing routines for auto loading the splash image from the
  locations as declared by the board
* Introduce the "splashsource" environment variable, which makes it
  possible to select the splash image source.

cm-t35 and cm-fx6 are updated to use the modified version.

Signed-off-by: Nikita Kiryanov <[email protected]>
Cc: Stefano Babic <[email protected]>
Cc: Tom Rini <[email protected]>
Cc: Igor Grinberg <[email protected]>
Cc: Anatolij Gustschin <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Acked-by: Igor Grinberg <[email protected]>