include: sbi_platform: Combine reboot and shutdown into one callback

We can achieve shutdown, cold reboot, and warm reboot using just
one sbi_platform callback so we combine system_reboot() and
system_shutdown() callbacks into one system_reset() callback.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

include/sbi/sbi_system.h

@@ -12,8 +12,6 @@
 
 #include <sbi/sbi_types.h>
 
-void __noreturn sbi_system_reboot(u32 type);
-
-void __noreturn sbi_system_shutdown(u32 type);
+void __noreturn sbi_system_reset(u32 platform_reset_type);
 
 #endif