DellEMC: Remove repeated files

ipmihelper files are repeated for few DellEMC platforms. Removed the
files in sonic_platform since as part of debian rules,ipmihelper will be
copied to necessary directory.

Author: aravindmani-1

platform/broadcom/sonic-platform-modules-dell/debian/rules

@@ -56,7 +56,6 @@ override_dh_auto_build:
 			python3 setup.py bdist_wheel -d $(MOD_SRC_DIR)/$${mod}/modules; \
 			cd $(MOD_SRC_DIR); \
 		elif [ $$mod = "n3248te" ]; then \
-			cp $(COMMON_DIR)/ipmihelper.py $(MOD_SRC_DIR)/$${mod}/sonic_platform/ipmihelper.py; \
 			cd $(MOD_SRC_DIR)/$${mod}; \
 			python3 setup.py bdist_wheel -d $(MOD_SRC_DIR)/$${mod}/modules; \
 			cd $(MOD_SRC_DIR); \
@@ -66,7 +65,6 @@ override_dh_auto_build:
 			python3 setup.py bdist_wheel -d $(MOD_SRC_DIR)/$${mod}/modules; \
 			cd $(MOD_SRC_DIR); \
 		elif [ $$mod = "n3248pxe" ]; then \
-			cp $(COMMON_DIR)/ipmihelper.py $(MOD_SRC_DIR)/$${mod}/sonic_platform/ipmihelper.py; \
 			cd $(MOD_SRC_DIR)/$${mod}; \
 			python3 setup.py bdist_wheel -d $(MOD_SRC_DIR)/$${mod}/modules; \
 			cd $(MOD_SRC_DIR); \