uboot-phytec

tools: omapimage: Fix mismatch of image size in header

The size field in GP header that is expected by ROM is size of the
image + size of the header. But omapimage tool is updating size
as image size + 2 * header size. Remove this extra header size bytes.

Reported-by: Denys Dmytriyenko <denys@ti.com>
Debugged-by: Madan Srinivas <madans@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>