[202012][Marvell] Update armhf SAI to ver 1.7.1-5 (#9118)

Fixed test_null_route_helper fix

Signed-off-by: Rajkumar Pennadam Ramamoorthy <[email protected]>

Author: rajkumar38

platform/marvell-armhf/sai.mk

@@ -1,6 +1,6 @@
 # Marvell SAI
 
-export MRVL_SAI_VERSION = 1.7.1-4
+export MRVL_SAI_VERSION = 1.7.1-5
 export MRVL_SAI = mrvllibsai_$(PLATFORM_ARCH)_$(MRVL_SAI_VERSION).deb
 
 $(MRVL_SAI)_SRC_PATH = $(PLATFORM_PATH)/sai