boot/uboot: rename TI_K3_DM option to cover further TI K3 SoCs support

BR2_TARGET_UBOOT_NEEDS_TI_K3_DM option has been introduced initially to
support certain TI K3 devices such as AM62x and AM62Ax that require a
Device Manager (DM) firmware.

This option needs to be renamed to use a more generic name in order
to cover further TI K3 SoCs support along with the new u-boot binman
tool that will be added in followup patch. With binman enabled in
u-boot on TI K3 SoC, ti-k3-boot-firmware is needed at buildtime to
provide ti-sysfw (System Firmware) for all TI K3 SoC along with Device
Manager (DM) firmware for AM62x and AM62Ax devices.

With binman support enabled, we don't need to provide the path of the
Device Manager firmware anymore (see [2]).
We can remove DM="<DM firmware>.xer5f" from UBOOT_MAKE_OPTS.
It also means that we can also remove BR2_TARGET_UBOOT_TI_K3_DM_SOCNAME
used to define DM path.

  DM=$(BINARIES_DIR)/ti-dm/$(UBOOT_TI_K3_DM_SOCNAME)/ipc_echo_testb_mcu1_0_release_strip.xer5f

For now, keep BR2_TARGET_UBOOT_TI_K3_DM_SOCNAME and DM only when
ti-k3-image-gen is used. We need to update ti_am62x_sk_defconfig
to use binman before removing them along with ti-k3-image-gen.

[1] 52ce606c05ee3ac869f8087292bc3dbb0d25b79b
[2] https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_01_00_08/exports/docs/linux/Foundational_Components/U-Boot/UG-General-Info.html

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
4 files changed