armv7m: add instruction & data cache support

This patch adds armv7m instruction & data cache support.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
cc: Christophe KERELLO <christophe.kerello@st.com>
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index b95e105..6e96cfb 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -55,8 +55,10 @@
 
 obj-y	+= cache.o
 ifndef CONFIG_ARM64
+ifndef CONFIG_CPU_V7M
 obj-y	+= cache-cp15.o
 endif
+endif
 
 obj-y	+= psci-dt.o