boot/uboot: remove BR2_TARGET_UBOOT_TI_K3_DM_SOCNAME

Previoulsy (without binman), when a TI K3 SoC using Combined binary
with a split firmware boot method was used (am62ax or am62x) [1], the
user had to select BR2_TARGET_UBOOT_NEEDS_TI_K3_DM in the defconfig
to provide Device Manager firmware provided by ti-k3-boot-firmware.

With binman, this option is no longer necessary since
ti-k3-boot-firmware package is already in the u-boot dependency and the
path to DM and SYSFW binaries are provided by BINMAN_INDIRS.

We are going to remove ti-k3-image-gen, so binman is now mandatory on
all TI K3 SoCs.

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/52ce606c05ee3ac869f8087292bc3dbb0d25b79b

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

boot/uboot/Config.in

@@ -251,19 +251,6 @@ config BR2_TARGET_UBOOT_NEEDS_TI_K3_BOOT_FIRMWARE
 	  j721e) also need the Device Manager (DM) firmware to be
 	  available for the U-Boot build.
 
-if BR2_TARGET_UBOOT_NEEDS_TI_K3_BOOT_FIRMWARE
-
-# TI_K3_DM_SOCNAME is only needed when ti-k3-image-gen is used for
-# TI K3 devices using the Device Manager (DM) firmware.
-# We use the SoC selection defined for the ti-k3-image-gen
-# package.
-config BR2_TARGET_UBOOT_TI_K3_DM_SOCNAME
-	string
-	default "am62axx" if BR2_TARGET_TI_K3_IMAGE_GEN_SOC_AM62AX
-	default "am62xx"  if BR2_TARGET_TI_K3_IMAGE_GEN_SOC_AM62X
-
-endif
-
 config BR2_TARGET_UBOOT_NEEDS_OPENSBI
 	bool "U-Boot needs OpenSBI"
 	depends on BR2_TARGET_OPENSBI

boot/uboot/uboot.mk

@@ -195,11 +195,7 @@ UBOOT_MAKE_OPTS += TEE=$(BINARIES_DIR)/tee.elf
 endif
 
 ifeq ($(BR2_TARGET_UBOOT_NEEDS_TI_K3_BOOT_FIRMWARE),y)
-UBOOT_TI_K3_DM_SOCNAME = $(call qstrip,$(BR2_TARGET_UBOOT_TI_K3_DM_SOCNAME))
 UBOOT_DEPENDENCIES += ti-k3-boot-firmware
-ifneq ($(UBOOT_TI_K3_DM_SOCNAME),)
-UBOOT_MAKE_OPTS += DM=$(BINARIES_DIR)/ti-dm/$(UBOOT_TI_K3_DM_SOCNAME)/ipc_echo_testb_mcu1_0_release_strip.xer5f
-endif
 endif
 
 ifeq ($(BR2_TARGET_UBOOT_NEEDS_OPENSBI),y)