platform: msm8996: Fixes needed to support qusb2 phy updates

Add API to detect 8996 hw platform. And move the QUSB
iomap to common header file

Change-Id: Iadd7928bb52505b86d11c8be497069bdae81b1aa
diff --git a/include/platform.h b/include/platform.h
index 623473b..a513843 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -67,4 +67,5 @@
 int boot_device_mask(int);
 uint32_t platform_detect_panel();
 uint32_t platform_get_max_periph();
+int platform_is_msm8996();
 #endif