USB: musb: make HAVE_CLK support optional

The Blackfin port doesn't support HAVE_CLK and the musb driver works fine
with support stubbed out, so take the existing Blackfin clk stubs and move
them to common musb code so we can drop the Kconfig dependency.

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/musb/musb_regs.h

@@ -439,15 +439,6 @@ static inline void  musb_write_txhubport(void __iomem *mbase, u8 epnum,
 /* Not implemented - HW has seperate Tx/Rx FIFO */
 #define MUSB_TXCSR_MODE			0x0000
 
-/*
- * Dummy stub for clk framework, it will be removed
- * until Blackfin supports clk framework
- */
-#define clk_get(dev, id)	NULL
-#define clk_put(clock)		do {} while (0)
-#define clk_enable(clock)	do {} while (0)
-#define clk_disable(clock)	do {} while (0)
-
 static inline void musb_write_txfifosz(void __iomem *mbase, u8 c_size)
 {
 }