intel_scu_ipc: tidy up unused bits

Delete unused constants IPC_CMD_INDIRECT_RD and IPC_CMD_INDIRECT_WR
Remove multiple inclusion of header file "asm/mrst.h"
Signed-off-by: NSreedhara DS <sreedhara.ds@intel.com>
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NMatthew Garrett <mjg@redhat.com>

drivers/platform/x86/intel_scu_ipc.c

@@ -38,10 +38,6 @@
 #define IPC_CMD_PCNTRL_R      1 /* Register read */
 #define IPC_CMD_PCNTRL_M      2 /* Register read-modify-write */
 
-/* Miscelaneous Command ids */
-#define IPC_CMD_INDIRECT_RD   2 /* 32bit indirect read */
-#define IPC_CMD_INDIRECT_WR   5 /* 32bit indirect write */
-
 /*
  * IPC register summary
  *