[platform/broadcom]: Makefile changes for arista-fwutil (sonic-net#582)

#### Description for the changelog

Add facilities to include arista fwutil into image if deb is in repo. Arista fwutil is proprietary and will be included in private repos

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#### Why I did it
This utility is required for updating optics firmware on eos->sonic conversion for chassis

##### Work item tracking
- Microsoft ADO **(number only)**:

#### How I did it
Add makefile entries to copy and install the deb if it exists

#### How to verify it
Build image with the deb in platform/broadcom/extra-debs and see if it is in the image
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#### Which release branch to backport (provide reason below if selected)

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- [ x] 202405

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Author: mssonicbld

platform/broadcom/one-aboot.mk

@@ -14,6 +14,9 @@ $(SONIC_ONE_ABOOT_IMAGE)_INSTALLS += $(ARISTA_PLATFORM_MODULE_PYTHON3) \
                                      $(ARISTA_PLATFORM_MODULE_DRIVERS) \
                                      $(ARISTA_PLATFORM_MODULE_LIBS) \
                                      $(ARISTA_PLATFORM_MODULE)
+ifeq ($(INSTALL_ARISTA_FWUTIL),y)
+$(SONIC_ONE_ABOOT_IMAGE)_INSTALLS += $(ARISTA_FWUTIL)
+endif
 ifeq ($(INSTALL_DEBUG_TOOLS),y)
 $(SONIC_ONE_ABOOT_IMAGE)_DOCKERS += $(SONIC_INSTALL_DOCKER_DBG_IMAGES)
 $(SONIC_ONE_ABOOT_IMAGE)_DOCKERS += $(filter-out $(patsubst %-$(DBG_IMAGE_MARK).gz,%.gz, $(SONIC_INSTALL_DOCKER_DBG_IMAGES)), $(SONIC_INSTALL_DOCKER_IMAGES))

platform/broadcom/platform-modules-arista.mk

@@ -22,3 +22,14 @@ export ARISTA_PLATFORM_MODULE \
        ARISTA_PLATFORM_MODULE_PYTHON3 \
        ARISTA_PLATFORM_MODULE_DRIVERS \
        ARISTA_PLATFORM_MODULE_LIBS
+
+ARISTA_FWUTIL_VERSION = 1.0.1
+ARISTA_FWUTIL = arista-fwutil_$(ARISTA_FWUTIL_VERSION)_amd64.deb
+$(ARISTA_FWUTIL)_PATH = $(PLATFORM_PATH)/extra-debs
+
+#Install fwutil package if it exists
+ifneq (,$(wildcard $($(ARISTA_FWUTIL)_PATH)/$(ARISTA_FWUTIL)))
+SONIC_COPY_DEBS += $(ARISTA_FWUTIL)
+INSTALL_ARISTA_FWUTIL = y
+endif
+