libc/arm: add cortex-a7 cpu variant

Change-Id: I541d665805ea69ca96bb6a5f4d50e56287f8c08c
Signed-off-by: Dima Zavin <dima@android.com>
diff --git a/libc/arch-arm/cortex-a7/cortex-a7.mk b/libc/arch-arm/cortex-a7/cortex-a7.mk
new file mode 100644
index 0000000..9af03d9
--- /dev/null
+++ b/libc/arch-arm/cortex-a7/cortex-a7.mk
@@ -0,0 +1 @@
+include bionic/libc/arch-arm/cortex-a15/cortex-a15.mk