U-Boot Configuration Changes - 2021.1 English

The following changes were made:

• Added a new menuconfig option to check/modify the default bootscript images offsets or images names at petalinux-config > u-boot Configuration > u-boot script configuration. The modified offsets are added into the final boot.scr that is generated using petalinux-build command.
• Added a new menuconfig, u-boot-ext-dtb, to build a separate dtb for U-Boot. You can build a U-Boot dtb from design or by specifying the dts file.
• Changed petalinux-config > u-boot configuration > u-boot config.