common: Increase static padding to 8 KiB
In cases, where multible DTBss are included, the kernel FIT image FIT metadata can grow beyond 4 KiB. Running mkimage with a static external position of image data of 4KB will cause an error. Increase the limit to 8 KB to give enough space for more FIT metadata.
Signed-off-by: Andreas Gnau andreas.gnau@iopsys.eu