lcd: expand console api

Introduce set_console_row(), set_console_col(), and lcd_init_console().
Use these functions in lcd functions: lcd_init(), lcd_clear(), lcd_logo().

This is a preparatory step for extracting lcd console code into its own
file.

Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>