target: display: add supports of edp panel

Add edp support functions, such as clock, backlight and
edp panel type.

CRs-Fixed: 661151
Change-Id: I4acc69c90dc0fee2930ea2d55b167ef317c58f87
diff --git a/platform/apq8084/include/platform/iomap.h b/platform/apq8084/include/platform/iomap.h
index 08d3e3b..241285f 100644
--- a/platform/apq8084/include/platform/iomap.h
+++ b/platform/apq8084/include/platform/iomap.h
@@ -213,6 +213,8 @@
 #define BOOT_CONFIG_OFFSET          0x00006034
 #define BOOT_CONFIG_REG             (SEC_CTRL_CORE_BASE+BOOT_CONFIG_OFFSET)
 
+#define EDP_BASE                    (0xFD923400)
+
 #define SOFT_RESET                  0x118
 #define CLK_CTRL                    0x11C
 #define TRIG_CTRL                   0x084