platform: msm_shared: integrate dload & normal reboot reason in a function

Integrate dload & normal reboot reason in a function, so that it could
avoid the normal reboot reason macro collision with dload mode.

Change-Id: Icc7c9d465e6c993d71e84bd793c5650bf51a4d28
diff --git a/include/platform.h b/include/platform.h
index 31de506..f97273a 100644
--- a/include/platform.h
+++ b/include/platform.h
@@ -58,7 +58,7 @@
 uint32_t check_alarm_boot(void);
 void platform_uninit_timer(void);
 void reboot_device(unsigned);
-int set_download_mode(enum dload_mode mode);
+int set_download_mode(enum reboot_reason mode);
 uint32_t platform_get_smem_base_addr();
 uint32_t platform_get_sclk_count(void);
 void clock_config_cdc(uint32_t interface);