lcd: refactor lcd console stuff into its own file

lcd: refactor lcd console stuff into its own file

common/lcd.c is a mix of code portions that do different but related
things. To improve modularity, the various code portions should be split
into their own modules. Separate lcd console code into its own file.

Signed-off-by: Nikita Kiryanov <[email protected]>
Cc: Anatolij Gustschin <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Stephen Warren <[email protected]>
Acked-by: Simon Glass <[email protected]>
Tested-by: Simon Glass <[email protected]>