[ARM] 3235/1: SharpSL PM: Fix a gcc4 build error

Patch from Richard Purdie

Fix a gcc4 build error (incomplete element type) in the pxa SharpSL
PM code.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/sharpsl.h

@@ -7,6 +7,7 @@
  *
  */
 
+#include <asm/hardware/sharpsl_pm.h>
 
 /*
  * SharpSL SSP Driver