ARC: fix broken makefile construct

Signed-off-by: Vineet Gupta <[email protected]>

Author: vineetgarc

arch/arc/Makefile

@@ -15,8 +15,8 @@ endif
 KBUILD_DEFCONFIG := nsim_700_defconfig
 
 cflags-y	+= -fno-common -pipe -fno-builtin -D__linux__
-cflags-${CONFIG_ISA_ARCOMPACT}	+= -mA7
-cflags-${CONFIG_ISA_ARCV2}	+= -mcpu=archs
+cflags-$(CONFIG_ISA_ARCOMPACT)	+= -mA7
+cflags-$(CONFIG_ISA_ARCV2)	+= -mcpu=archs
 
 ifdef CONFIG_ARC_CURR_IN_REG
 # For a global register defintion, make sure it gets passed to every file