board-8064: Add boot param to enable MHL

This change extends the existing boot parameter that specifies
the external display to add the capability to enable the
MHL transmitter.

Change-Id: I062bb68c7b94bc0f84771f5fafe7208d0a362484
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>
(cherry picked from commit de80944923f84837afc9f83ba11cb251a5d59aef)

Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>
diff --git a/arch/arm/mach-msm/board-8064.h b/arch/arm/mach-msm/board-8064.h
index 308c1b1..1437b3b 100644
--- a/arch/arm/mach-msm/board-8064.h
+++ b/arch/arm/mach-msm/board-8064.h
@@ -92,6 +92,7 @@
 #define APQ_8064_GSBI5_QUP_I2C_BUS_ID 5
 
 unsigned char apq8064_hdmi_as_primary_selected(void);
+unsigned char apq8064_mhl_display_enabled(void);
 void apq8064_init_fb(void);
 void apq8064_allocate_fb_region(void);
 void apq8064_mdp_writeback(struct memtype_reserve *reserve_table);