toolchain.mk: Add *-toolchain suffix to targets

Suffix *-toolchain allows to describe the Makefile target that it is
meant to download toolchain for a particular target architecture.

Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Yuan Zhuang <yuanz@apache.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
diff --git a/toolchain.mk b/toolchain.mk
index 517b913..d8be58f 100644
--- a/toolchain.mk
+++ b/toolchain.mk
@@ -57,14 +57,14 @@
 SRC_AARCH64_GCC 		?= https://developer.arm.com/-/media/Files/downloads/gnu/11.3.rel1/binrel/$(AARCH64_GCC_VERSION).tar.xz
 
 .PHONY: toolchains
-toolchains: aarch32 aarch64
+toolchains: aarch32-toolchain aarch64-toolchain
 
-.PHONY: aarch32
-aarch32:
+.PHONY: aarch32-toolchain
+aarch32-toolchain:
 	$(call dltc,$(AARCH32_PATH),$(SRC_AARCH32_GCC),$(AARCH32_GCC_VERSION))
 
-.PHONY: aarch64
-aarch64:
+.PHONY: aarch64-toolchain
+aarch64-toolchain:
 	$(call dltc,$(AARCH64_PATH),$(SRC_AARCH64_GCC),$(AARCH64_GCC_VERSION))
 
 CLANG_VER			?= 12.0.0
@@ -91,10 +91,10 @@
 SRC_RISCV64_GCC			?= https://github.com/riscv-collab/riscv-gnu-toolchain/releases/download/$(RISCV64_GCC_RELEASE_DATE)/$(RISCV64_GCC_VERSION).tar.gz
 
 .PHONY: toolchains
-toolchains: riscv64
+toolchains: riscv64-toolchain
 
-.PHONY: riscv64
-riscv64:
+.PHONY: riscv64-toolchain
+riscv64-toolchain:
 	$(call dltc,$(RISCV64_PATH),$(SRC_RISCV64_GCC),$(RISCV64_GCC_VERSION))
 
 endif
@@ -115,10 +115,10 @@
 AARCH64_CROSS_COMPILE 		?= $(AARCH64_PATH)/bin/aarch64-linux-
 
 .PHONY: toolchains
-toolchains: aarch32 $(AARCH64_PATH)/.done
+toolchains: aarch32-toolchain $(AARCH64_PATH)/.done
 
-.PHONY: aarch32
-aarch32:
+.PHONY: aarch32-toolchain
+aarch32-toolchain:
 	$(call dltc,$(AARCH32_PATH),$(SRC_AARCH32_GCC),$(AARCH32_GCC_VERSION))
 
 $(AARCH64_PATH)/.done: