[ARM] 5526/1: ep93xx: usb driver cleanup

Cleanup the ohci-ep93xx driver.

1) Use the usb.h dbg() macro instead of pr_debug() so that
   the source filename is prefixed to the message and it is
   terminated with a linefeed.

2) Add error handling for the clk_get() call.

3) Update clkdev support so that the usb clock is matched by
   the dev_id instead of the con_id.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-ep93xx/clock.c

@@ -103,7 +103,7 @@ static struct clk_lookup clocks[] = {
 	INIT_CK(NULL, "hclk", &clk_h),
 	INIT_CK(NULL, "pclk", &clk_p),
 	INIT_CK(NULL, "pll2", &clk_pll2),
-	INIT_CK(NULL, "usb_host", &clk_usb_host),
+	INIT_CK("ep93xx-ohci", NULL, &clk_usb_host),
 	INIT_CK(NULL, "m2p0", &clk_m2p0),
 	INIT_CK(NULL, "m2p1", &clk_m2p1),
 	INIT_CK(NULL, "m2p2", &clk_m2p2),