hikey*, poplar: platform.mk: Fix typo in variable assignments

Signed-off-by: Victor Chong <victor.chong@linaro.org>

plat/hisilicon/hikey/platform.mk

@@ -9,11 +9,11 @@ LOAD_IMAGE_V2	:=	1
 
 # On Hikey, the TSP can execute from TZC secure area in DRAM (default)
 # or SRAM.
-HIKEY_TSP_RAM_LOCATION	:=	dram
+HIKEY_TSP_RAM_LOCATION	?=	dram
 ifeq (${HIKEY_TSP_RAM_LOCATION}, dram)
   HIKEY_TSP_RAM_LOCATION_ID = HIKEY_DRAM_ID
 else ifeq (${HIKEY_TSP_RAM_LOCATION}, sram)
-  HIKEY_TSP_RAM_LOCATION_ID := HIKEY_SRAM_ID
+  HIKEY_TSP_RAM_LOCATION_ID = HIKEY_SRAM_ID
 else
   $(error "Currently unsupported HIKEY_TSP_RAM_LOCATION value")
 endif

plat/hisilicon/hikey960/platform.mk

@@ -8,11 +8,11 @@
 LOAD_IMAGE_V2	:=	1
 
 # On Hikey960, the TSP can execute from TZC secure area in DRAM.
-HIKEY960_TSP_RAM_LOCATION	:=	dram
+HIKEY960_TSP_RAM_LOCATION	?=	dram
 ifeq (${HIKEY960_TSP_RAM_LOCATION}, dram)
   HIKEY960_TSP_RAM_LOCATION_ID = HIKEY960_DRAM_ID
 else ifeq (${HIKEY960_TSP_RAM_LOCATION}, sram)
-  HIKEY960_TSP_RAM_LOCATION_ID := HIKEY960_SRAM_ID
+  HIKEY960_TSP_RAM_LOCATION_ID = HIKEY960_SRAM_ID
 else
   $(error "Currently unsupported HIKEY960_TSP_RAM_LOCATION value")
 endif

plat/hisilicon/poplar/platform.mk

@@ -8,11 +8,11 @@
 LOAD_IMAGE_V2	:=	1
 
 # On Poplar, the TSP can execute from TZC secure area in DRAM.
-POPLAR_TSP_RAM_LOCATION	:=	dram
+POPLAR_TSP_RAM_LOCATION	?=	dram
 ifeq (${POPLAR_TSP_RAM_LOCATION}, dram)
   POPLAR_TSP_RAM_LOCATION_ID = POPLAR_DRAM_ID
 else ifeq (${POPLAR_TSP_RAM_LOCATION}, sram)
-  POPLAR_TSP_RAM_LOCATION_ID := POPLAR_SRAM_ID
+  POPLAR_TSP_RAM_LOCATION_ID = POPLAR_SRAM_ID
 else
   $(error "Currently unsupported POPLAR_TSP_RAM_LOCATION value")
 endif