usb: musb: Remove unused function declarations

Commit 32fee1df ("usb: musb: remove unused davinci support")
removed these implementations but leave declaration.
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20230807140928.35932-1-yuehaibing@huawei.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/musb/cppi_dma.h

@@ -121,9 +121,6 @@ struct cppi {
 	struct list_head		tx_complete;
 };
 
-/* CPPI IRQ handler */
-extern irqreturn_t cppi_interrupt(int, void *);
-
 struct cppi41_dma_channel {
 	struct dma_channel channel;
 	struct cppi41_dma_controller *controller;

drivers/usb/musb/musb_dma.h

@@ -198,10 +198,6 @@ extern struct dma_controller *
 tusb_dma_controller_create(struct musb *musb, void __iomem *base);
 extern void tusb_dma_controller_destroy(struct dma_controller *c);
 
-extern struct dma_controller *
-cppi_dma_controller_create(struct musb *musb, void __iomem *base);
-extern void cppi_dma_controller_destroy(struct dma_controller *c);
-
 extern struct dma_controller *
 cppi41_dma_controller_create(struct musb *musb, void __iomem *base);
 extern void cppi41_dma_controller_destroy(struct dma_controller *c);