issue #90: don't apply ARM options to ARM64

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

Makefile

@@ -1171,13 +1171,6 @@ endif
 
 ifeq ($(CONFIG_MP_VHT_HW_TX_MODE), y)
 EXTRA_CFLAGS += -DCONFIG_MP_VHT_HW_TX_MODE
-ifeq ($(CONFIG_PLATFORM_I386_PC), y)
-## For I386 X86 ToolChain use Hardware FLOATING
-EXTRA_CFLAGS += -mhard-float
-else
-## For ARM ToolChain use Hardware FLOATING
-EXTRA_CFLAGS += -mfloat-abi=hard
-endif
 endif
 
 ####START RASPBERRY PI SUPPORT
@@ -2106,6 +2099,14 @@ endif
 
 endif
 
+ifeq ($(ARCH), i386)
+EXTRA_CFLAGS += -mhard-float
+else ifeq ($(ARCH), x86_64)
+EXTRA_CFLAGS += -mhard-float
+else ifeq ($(ARCH), arm)
+EXTRA_CFLAGS += -mfloat-abi=hard
+endif
+
 ifeq ($(CONFIG_MULTIDRV), y)
 
 ifeq ($(CONFIG_SDIO_HCI), y)