Include start-of-region address

Include start-of-region address

When $ADDRESS == $BASE that address used to be excluded.

After this commit $ADDRESS == $BASE is within the range.

Now the rule for "iswithin" is:
$BASE <= $ADDRESS < ($BASE + $LEN)

Thanks to Antonio Borneo <borneo.antonio@gmail.com> for noticing this.

Change-Id: I74373c6010e069372d886fa7ecd8120892616834
Signed-off-by: Piotr Kasprzyk <ciri@ciri.pl>
Reviewed-on: http://openocd.zylin.com/4799
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>