mailbox: pl320-ipc: Drop unused xxx_destination functions

set_destination() and clear_destination() are static functions not used
anywhere in the code:

  pl320-ipc.c:48:20: error: unused function 'set_destination' [-Werror,-Wunused-function]
  pl320-ipc.c:54:20: error: unused function 'clear_destination' [-Werror,-Wunused-function]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Author: krzk

drivers/mailbox/pl320-ipc.c

@@ -45,18 +45,6 @@ static DEFINE_MUTEX(ipc_m1_lock);
 static DECLARE_COMPLETION(ipc_completion);
 static ATOMIC_NOTIFIER_HEAD(ipc_notifier);
 
-static inline void set_destination(int source, int mbox)
-{
-	writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxDSET(mbox));
-	writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxMSET(mbox));
-}
-
-static inline void clear_destination(int source, int mbox)
-{
-	writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxDCLEAR(mbox));
-	writel_relaxed(CHAN_MASK(source), ipc_base + IPCMxMCLEAR(mbox));
-}
-
 static void __ipc_send(int mbox, u32 *data)
 {
 	int i;