clk: pxa: fix building on older compilers

gcc-4.4 got confused by the inline assembler statement:

drivers/clk/pxa/clk-pxa.c: In function 'pxa2xx_core_turbo_switch':
drivers/clk/pxa/clk-pxa.c:152: error: expected string literal before ')' token

This removes the extraneous ':' to let all compilers parse the
driver correctly.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/pxa/clk-pxa.c

@@ -147,9 +147,7 @@ void pxa2xx_core_turbo_switch(bool on)
 	"	b	3f\n"
 	"2:	b	1b\n"
 	"3:	nop\n"
-		: "=&r" (unused)
-		: "r" (clkcfg)
-		: );
+		: "=&r" (unused) : "r" (clkcfg));
 
 	local_irq_restore(flags);
 }