build(qemu): Add measured boot build for qemu

Signed-off-by: Ruchika Gupta <ruchika.gupta@linaro.org>
Change-Id: I23df4b60956e871570558cd54a051c900882d2da
diff --git a/tf_config/qemu-mb_hash256 b/tf_config/qemu-mb_hash256
new file mode 100644
index 0000000..5145502
--- /dev/null
+++ b/tf_config/qemu-mb_hash256
@@ -0,0 +1,4 @@
+CROSS_COMPILE=aarch64-none-elf-
+MEASURED_BOOT=1
+PLAT=qemu
+TPM_HASH_ALG=sha256