target/armv8: change prototype of display_cache_info()

target/armv8: change prototype of display_cache_info()

To prepare for handling TCL return values consistently, all calls
to command_print/command_print_sameline should be ready to switch
to CMD as first parameter.

Change prototype of display_cache_info(),
armv8_handle_inner_cache_info_command() and
armv8_handle_cache_info_command() to pass CMD instead of CMD_CTX.

This change was part of http://openocd.zylin.com/1815 from Paul
Fertser and has been extracted and rebased to simplify the review.

Change-Id: I13519c79af82cdba57d5205ba84a5a27fce65a36
Signed-off-by: Paul Fertser <fercerpav@gmail.com>
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5066
Tested-by: jenkins