MXS platforms (imx23 and imx28) are relying on bootlets as their first
stage bootloaders, that can then either start a regular second stage
bootloader or directly a Linux kernel. However, the Makefile allows
only to build u-boot and linux images at the same time, which is
not very convenient as we will more likely use only one of them,
so we need to duplicate a bit what is already done so that we are able
to choose what we want to generate.
* Remove incorrect dependency on BR2_PACKAGE_ELFTOSB
* Each board configuration option is for one board, not multiple
boards, so use singular.
* The i.MX28 support is for i.MX28 EVK only, reflect that in the
option prompt and the option name.
* Use 'generic-package' instead of GENTARGETS
Signed-off-by: Maxime Ripard <firstname.lastname@example.org>
Signed-off-by: Thomas Petazzoni <email@example.com>