[Build] Fix the dash cache dependency issue (#15851)

#### Why I did it
[Build] Fix the dash cache dependency issue
```
12:47:34  [ finished ] [ target/files/bullseye/ctrmgrd.service ]
12:47:36  fatal: Unable to hash src/sonic-dash-api/sonic-dash-api
12:47:36  make: *** [Makefile.cache:528: target/debs/bullseye/libdashapi_1.0.0_amd64.deb.smdep] Error 123
12:47:36  make: *** Waiting for unfinished jobs....
```

##### Work item tracking
- Microsoft ADO **(number only)**: 24547630

Author: xumia

rules/sonic-dash-api.dep

@@ -2,7 +2,8 @@
 SPATH       := $($(LIB_SONIC_DASH_API)_SRC_PATH)
 DEP_FILES   := $(SONIC_COMMON_FILES_LIST) rules/sonic-dash-api.mk rules/sonic-dash-api.dep   
 DEP_FILES   += $(SONIC_COMMON_BASE_FILES_LIST)
-SMDEP_FILES := $(addprefix $(SPATH)/,$(shell cd $(SPATH) && git ls-files))
+DEP_FILES   += $(shell git ls-files $(SPATH) | grep -v sonic-dash-api)
+SMDEP_FILES := $(addprefix $(SPATH)/sonic-dash-api/,$(shell cd $(SPATH)/sonic-dash-api && git ls-files))
 
 $(LIB_SONIC_DASH_API)_CACHE_MODE  := GIT_CONTENT_SHA 
 $(LIB_SONIC_DASH_API)_DEP_FLAGS   := $(SONIC_COMMON_FLAGS_LIST)