talos-2: Move PPC-style tgz update package targets to targets/

Move the targets generating talos-2's tgz update package to targets.

While this wasn't duplicated, it breaks a cyclic dependency between
board config and BRAND_NAME by moving the ROM output name dependencies
later.  The logic probably would be shared with similar boards if any
were supported, so it is in the spirit of the other targets/ shared
target Makefiles.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>

Author: JonathonHall-Purism

boards/talos-2/talos-2.config

@@ -50,20 +50,4 @@ export CONFIG_BOOT_DEV="/dev/nvme0n1p2"
 export CONFIG_BOARD_NAME="Talos 2"
 export CONFIG_FLASHROM_OPTIONS="--noverify-all -p linux_mtd"
 
-OUTPUT_PREFIX	:= heads-$(BOARD)-$(HEADS_GIT_VERSION)
-BUNDLED_LINUX	:= $(OUTPUT_PREFIX)-zImage.bundled
-OUTPUT_FILES	:= $(CB_OUTPUT_FILE) $(CB_BOOTBLOCK_FILE) $(BUNDLED_LINUX)
-
-all: $(board_build)/$(BUNDLED_LINUX)
-$(board_build)/$(BUNDLED_LINUX): $(board_build)/zImage.bundled
-	$(call do-copy,$<,$@)
-
-all: $(board_build)/$(OUTPUT_PREFIX).tgz
-$(board_build)/$(OUTPUT_PREFIX).tgz: \
-	$(addprefix $(board_build)/,$(OUTPUT_FILES))
-	rm -rf $(board_build)/pkg # cleanup in case directory exists
-	mkdir $(board_build)/pkg
-	cp $^ $(board_build)/pkg
-	cd $(board_build)/pkg && sha256sum * > sha256sum.txt
-	cd $(board_build)/pkg && tar zcf $@ *
-	rm -r $(board_build)/pkg
+BOARD_TARGETS := ppc_tgz

targets/ppc_tgz.mk

@@ -0,0 +1,17 @@
+OUTPUT_PREFIX	:= heads-$(BOARD)-$(HEADS_GIT_VERSION)
+BUNDLED_LINUX	:= $(OUTPUT_PREFIX)-zImage.bundled
+OUTPUT_FILES	:= $(CB_OUTPUT_FILE) $(CB_BOOTBLOCK_FILE) $(BUNDLED_LINUX)
+
+all: $(board_build)/$(BUNDLED_LINUX)
+$(board_build)/$(BUNDLED_LINUX): $(board_build)/zImage.bundled
+	$(call do-copy,$<,$@)
+
+all: $(board_build)/$(OUTPUT_PREFIX).tgz
+$(board_build)/$(OUTPUT_PREFIX).tgz: \
+	$(addprefix $(board_build)/,$(OUTPUT_FILES))
+	rm -rf $(board_build)/pkg # cleanup in case directory exists
+	mkdir $(board_build)/pkg
+	cp $^ $(board_build)/pkg
+	cd $(board_build)/pkg && sha256sum * > sha256sum.txt
+	cd $(board_build)/pkg && tar zcf $@ *
+	rm -r $(board_build)/pkg