feat(msm8916): add port for MSM8939

The Qualcomm Snapdragon 615 (MSM8939) SoC is very similar to the
existing MSM8916, except for:

  - Two clusters with ARM Cortex-A53 cores
  - CCI-400

Make the existing MSM8916 platform port usable for MSM8939 as well by
adding some minimal if statements where necessary plus the platform
make files for msm8939.

Change-Id: I8cda83dc642f62222f984a42eec14de5df4c11e3
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
diff --git a/plat/qti/msm8916/msm8916_setup.c b/plat/qti/msm8916/msm8916_setup.c
index 270bae1..9576ea4 100644
--- a/plat/qti/msm8916/msm8916_setup.c
+++ b/plat/qti/msm8916/msm8916_setup.c
@@ -49,7 +49,7 @@
 static const struct uartdm_gpios uartdm_gpio_map[] = {
 #if defined(PLAT_msm8909)
 	{4, 5, 0x2}, {20, 21, 0x3},
-#elif defined(PLAT_msm8916)
+#elif defined(PLAT_msm8916) || defined(PLAT_msm8939)
 	{0, 1, 0x2}, {4, 5, 0x2},
 #endif
 };