video: Drop unused console functions

CONFIG_CONSOLE_CURSOR, CONFIG_SYS_CONSOLE_BLINK_COUNT and
CONFIG_CONSOLE_TIME are not used by any board. The implementation is not
great and stands in the way of a refactor of i8042. Drop these for now.
They can be re-introduced quite easily later, perhaps with driver-model
real-time-clock (RTC) support.

When reintroducing, it might be useful to make a few changes:
- Blink time would be more useful than blink count
- The confusing #ifdefs should be avoided
- The time functions should support driver model
- It would be best keyed off console_tstc() or some similar idle loop
    rather than a particular input driver (i8042 in this case)

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

README

@@ -872,13 +872,6 @@ The following options need to be configured:
 						(i.e. i8042_tstc)
 			VIDEO_GETC_FCT		get char fct
 						(i.e. i8042_getc)
-			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
-						(requires blink timer
-						cf. i8042.c)
-			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
-			CONFIG_CONSOLE_TIME	display time/date info in
-						upper right corner
-						(requires CONFIG_CMD_DATE)
 			CONFIG_VIDEO_LOGO	display Linux logo in
 						upper left corner
 			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of