Remove verity.mk, verity_key, PRODUCT_VERITY_SIGNING_KEY

verity.mk is used to set the related variable for VB 1.0 support, but
we already removed VB 1.0. This change removes the unused code. We also
remove and block PRODUCT_VERITY_SIGNING_KEY in this change.

Bug: 241044073
Test: atest under build/make
Change-Id: Ifbcde7da27a931ef3b9d746b1c5a279d88c0ec85
diff --git a/core/config.mk b/core/config.mk
index ad4491c..181bdcf 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -164,6 +164,7 @@
 $(KATI_obsolete_var PRODUCT_SUPPORTS_VERITY,VB 1.0 and related variables are no longer supported)
 $(KATI_obsolete_var PRODUCT_SUPPORTS_VERITY_FEC,VB 1.0 and related variables are no longer supported)
 $(KATI_obsolete_var PRODUCT_SUPPORTS_BOOT_SIGNER,VB 1.0 and related variables are no longer supported)
+$(KATI_obsolete_var PRODUCT_VERITY_SIGNING_KEY,VB 1.0 and related variables are no longer supported)
 # Used to force goals to build.  Only use for conditionally defined goals.
 .PHONY: FORCE
 FORCE:
diff --git a/core/product.mk b/core/product.mk
index fcfe891..ee2fa5a 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -165,7 +165,6 @@
 _product_list_vars += PRODUCT_LOADED_BY_PRIVILEGED_MODULES
 _product_single_value_vars += PRODUCT_VBOOT_SIGNING_KEY
 _product_single_value_vars += PRODUCT_VBOOT_SIGNING_SUBKEY
-_product_single_value_vars += PRODUCT_VERITY_SIGNING_KEY
 _product_single_value_vars += PRODUCT_SYSTEM_VERITY_PARTITION
 _product_single_value_vars += PRODUCT_VENDOR_VERITY_PARTITION
 _product_single_value_vars += PRODUCT_PRODUCT_VERITY_PARTITION
diff --git a/core/tasks/tools/build_custom_image.mk b/core/tasks/tools/build_custom_image.mk
index b89b23c..2626120 100644
--- a/core/tasks/tools/build_custom_image.mk
+++ b/core/tasks/tools/build_custom_image.mk
@@ -91,7 +91,6 @@
 $(my_built_custom_image): PRIVATE_COPY_PAIRS := $(my_copy_pairs)
 $(my_built_custom_image): PRIVATE_PICKUP_FILES := $(my_pickup_files)
 $(my_built_custom_image): PRIVATE_SELINUX := $(CUSTOM_IMAGE_SELINUX)
-$(my_built_custom_image): PRIVATE_VERITY_KEY := $(PRODUCT_VERITY_SIGNING_KEY)
 $(my_built_custom_image): PRIVATE_VERITY_BLOCK_DEVICE := $(CUSTOM_IMAGE_VERITY_BLOCK_DEVICE)
 $(my_built_custom_image): PRIVATE_DICT_FILE := $(CUSTOM_IMAGE_DICT_FILE)
 $(my_built_custom_image): PRIVATE_AVB_AVBTOOL := $(AVBTOOL)