cli, manpage: Clean up occurrences of old image argument

--include argument was introduced and replaced --image argument in
commit 45d50a101e

This patch cleans up remaining few places where old `--image`
argument was mentioned so that now all the documentation has
`--include`. --image is deprecated.

Both old --image and new --include have the same short version -i
and it remains the same. The code remains the same since the code
handles --include already.

Tested by running
flashrom -h
man ./flashrom.8.tmpl

Ticket: https://ticket.coreboot.org/issues/372

Original-Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/70003
Original-Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
Original-Reviewed-by: Felix Singer <felixsinger@posteo.net>
Original-Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
(cherry picked from commit 8274c6321a)

Change-Id: If457e2b8548034868105b515125d7e8b4d5f6134
Signed-off-by: Evan Benn <evanbenn@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/70326
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

flashrom.8.tmpl

@@ -49,7 +49,7 @@ flashrom \- detect, read, write, verify and erase flash chips
             (\fB\-\-flash\-name\fR|\fB\-\-flash\-size\fR|
              [\fB\-E\fR|\fB\-x\fR|\fB\-r\fR <file>|\fB\-w\fR <file>|\fB\-v\fR <file>]
              [(\fB\-l\fR <file>|\fB\-\-ifd\fR|\fB \-\-fmap\fR|\fB\-\-fmap-file\fR <file>)
-               [\fB\-i\fR <image>[:<file>]]]
+               [\fB\-i\fR <include>[:<file>]]]
              [\fB\-\-wp\-status\fR] [\fB\-\-wp\-list\fR] [\fB\-\-wp\-enable\fR|\fB\-\-wp\-disable\fR]
              [\fB\-\-wp\-range\fR <start>,<length>|\fB\-\-wp\-region\fR <region>]
              [\fB\-n\fR] [\fB\-N\fR] [\fB\-f\fR])]