Impact: cleanup

Fix:

 WARNING: Use #include <linux/io.h> instead of <asm/io.h>
 WARNING: Use #include <linux/delay.h> instead of <asm/delay.h>
 ERROR: trailing whitespace
 WARNING: externs should be avoided in .c files
 ERROR: space required after that ',' (ctx:VxV)
 WARNING: space prohibited between function name and open parenthesis '('

 total: 2 errors, 4 warnings
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>