tools: kwboot: don't adjust destaddr when patching the image

Commit 94084eea ("tools: kwbimage: Fix dest addr") changed kwbimage
to do this adjustment. So now the adjustment in kwboot is not needed
(and would prevent UART booting for images generated by the new
kwbimage). Remove the destaddr adjustment in kwboot.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>