stv0991: Add basic stv0991 architecture support

stv0991 architecture support added. It contains the support for
following blocks
- Timer
- uart

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
[trini: Add arch/arm/cpu/armv7/Makefile hunk]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/configs/stv0991_defconfig b/configs/stv0991_defconfig
new file mode 100644
index 0000000..a05e991
--- /dev/null
+++ b/configs/stv0991_defconfig
@@ -0,0 +1,3 @@
+CONFIG_SYS_EXTRA_OPTIONS="stv0991"
+CONFIG_ARM=y
+CONFIG_TARGET_STV0991=y