Fix dialout build flag issue. (sonic-net#17715)

### Why I did it
Fix ENABLE_DIALOUT flag issue.

##### Work item tracking
- Microsoft ADO **(number only)**: 21326000

#### How I did it
Update Makefile.work and add debug string.

#### How to verify it
![image](https://github.com/sonic-net/sonic-buildimage/assets/97083744/960d75d1-618c-4734-acb5-7a32a28c262b)

Makefile.work

@@ -40,6 +40,9 @@
 #  * ENABLE_NATIVE_WRITE: Enable native write/config operations via the gNMI interface.
 #  *                 Default: unset
 #  *                 Values: y
+#  * ENABLE_DIALOUT: Enable dialout client in telemetry.
+#  *                 Default: unset
+#  *                 Values: y
 #  * SONIC_DPKG_CACHE_METHOD: Specifying method of obtaining the Debian packages from cache: none or cache
 #  * SONIC_DPKG_CACHE_SOURCE: Debian package cache location when cache enabled for debian packages
 #  * BUILD_LOG_TIMESTAMP: Set timestamp in the build log (simple/none)
@@ -542,6 +545,7 @@ SONIC_BUILD_INSTRUCTION :=  $(MAKE) \
                            SONIC_INCLUDE_MUX=$(INCLUDE_MUX) \
                            ENABLE_TRANSLIB_WRITE=$(ENABLE_TRANSLIB_WRITE) \
                            ENABLE_NATIVE_WRITE=$(ENABLE_NATIVE_WRITE) \
+			   ENABLE_DIALOUT=$(ENABLE_DIALOUT) \
                            EXTRA_DOCKER_TARGETS=$(EXTRA_DOCKER_TARGETS) \
                            BUILD_LOG_TIMESTAMP=$(BUILD_LOG_TIMESTAMP) \
                            SONIC_ENABLE_IMAGE_SIGNATURE=$(ENABLE_IMAGE_SIGNATURE) \

slave.mk

@@ -431,6 +431,7 @@ $(info "ENABLE_BOOTCHART                 : "$(ENABLE_BOOTCHART)")
 $(info "ENABLE_FIPS_FEATURE"             : "$(ENABLE_FIPS_FEATURE)")
 $(info "ENABLE_TRANSLIB_WRITE"           : "$(ENABLE_TRANSLIB_WRITE)")
 $(info "ENABLE_NATIVE_WRITE"             : "$(ENABLE_NATIVE_WRITE)")
+$(info "ENABLE_DIALOUT"                  : "$(ENABLE_DIALOUT)")
 $(info "ENABLE_AUTO_TECH_SUPPORT"        : "$(ENABLE_AUTO_TECH_SUPPORT)")
 $(info "PDDF_SUPPORT"                    : "$(PDDF_SUPPORT)")
 $(info "MULTIARCH_QEMU_ENVIRON"          : "$(MULTIARCH_QEMU_ENVIRON)")