[Mellanox] Enhance MFT make file to download source code from any valid URL (sonic-net#13801)

- Why I did it
Currently, when building MFT, it can only download the source code from the official download site: http://www.mellanox.com/downloads/MFT/, it's not possible to integrate an internal version that has not been officially released yet.

The intention of this PR is to make it possible to download the source code from any valid link.

- How I did it
Add a new parameter "MLNX_MFT_INTERNAL_SOURCE_BASE_URL", if an URL is given, it will download the source code from the given URL, otherwise, it downloads from the default official site.

- How to verify it
Specify a valid URL in the make file, the MFT debs should be built successfully.

Signed-off-by: Kebo Liu <kebol@nvidia.com>

Author: keboliu

platform/mellanox/mft.mk

@@ -19,7 +19,15 @@
 MFT_VERSION = 4.21.0
 MFT_REVISION = 100
 
-export MFT_VERSION MFT_REVISION
+MLNX_MFT_INTERNAL_SOURCE_BASE_URL =
+
+ifneq ($(MLNX_MFT_INTERNAL_SOURCE_BASE_URL), )
+MFT_FROM_INTERNAL = y
+else
+MFT_FROM_INTERNAL = n
+endif
+
+export MFT_VERSION MFT_REVISION MFT_FROM_INTERNAL MLNX_MFT_INTERNAL_SOURCE_BASE_URL
 
 MFT = mft_$(MFT_VERSION)-$(MFT_REVISION)_$(CONFIGURED_ARCH).deb
 $(MFT)_SRC_PATH = $(PLATFORM_PATH)/mft

platform/mellanox/mft/Makefile

@@ -27,6 +27,12 @@ endif
 MFT_NAME = mft-$(MFT_VERSION)-$(MFT_REVISION)-$(MFT_ARCH)-deb
 MFT_TGZ = $(MFT_NAME).tgz
 
+ifeq ($(MFT_FROM_INTERNAL),y)
+MFT_TGZ_URL = $(MLNX_MFT_INTERNAL_SOURCE_BASE_URL)$(MFT_TGZ)
+else
+MFT_TGZ_URL = http://www.mellanox.com/downloads/MFT/$(MFT_TGZ)
+endif
+
 SRC_DEB = kernel-mft-dkms_$(MFT_VERSION)-$(MFT_REVISION)_all.deb
 MOD_DEB = kernel-mft-dkms-modules-$(KVERSION)_$(MFT_VERSION)_$(CONFIGURED_ARCH).deb
 
@@ -38,7 +44,7 @@ DKMS_TMP := $(shell mktemp -u -d -t dkms.XXXXXXXXXX)
 
 $(addprefix $(DEST)/, $(MAIN_TARGET)): $(DEST)/% :
 	rm -rf $(MFT_NAME)
-	wget -O $(MFT_TGZ) http://www.mellanox.com/downloads/MFT/$(MFT_TGZ)
+	wget -O $(MFT_TGZ) $(MFT_TGZ_URL)
 	tar xzf $(MFT_TGZ)
 
 	pushd $(MFT_NAME)/SDEBS