platform: Add clock related functions to clock header file

Add clock related function declarations to target specific
clock header files. In an effort to avoid compilation warnings.

Change-Id: If8b63a758c8becebcd3df8514b3146f1fe307b38
diff --git a/platform/apq8084/include/platform/clock.h b/platform/apq8084/include/platform/clock.h
index a3bb284..0a07c14 100644
--- a/platform/apq8084/include/platform/clock.h
+++ b/platform/apq8084/include/platform/clock.h
@@ -119,4 +119,12 @@
 void clock_ce_disable(uint8_t instance);
 void clock_usb30_init(void);
 
+void mmss_dsi_clock_enable(uint32_t dsi_pixel0_cfg_rcgr, uint32_t dual_dsi,
+	uint8_t pclk0_m, uint8_t pclk0_n, uint8_t pclk0_d);
+void mmss_dsi_clock_disable(uint32_t dual_dsi);
+void mmss_bus_clock_enable(void);
+void mmss_bus_clock_disable(void);
+void mdp_clock_enable(void);
+void mdp_clock_disable();
+
 #endif