ACPI: fix whitespace in pr_fmt() to align log entries

See this dmesg extract before the patch:

[ 0.679466] ACPI: Dynamic OEM Table Load:
[ 0.679470] ACPI: SSDT 0xFFFF910F6B497E00 00018A (v02 PmRef ApCst 00003000 INTL 20160422)
[ 0.679579] ACPI: Executed 1 blocks of module-level executable AML code
[ 0.681477] ACPI : EC: EC started
[ 0.681478] ACPI : EC: interrupt blocked
[ 0.684798] ACPI: Interpreter enabled
[ 0.684835] ACPI: (supports S0 S3 S4 S5)

Signed-off-by: Vincent Legoll <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/acpi_dbg.c

···
  */
 
 /* #define DEBUG */
-#define pr_fmt(fmt) "ACPI : AML: " fmt
+#define pr_fmt(fmt) "ACPI: AML: " fmt
 
 #include <linux/kernel.h>
 #include <linux/module.h>

drivers/acpi/button.c

···
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */
 
-#define pr_fmt(fmt) "ACPI : button: " fmt
+#define pr_fmt(fmt) "ACPI: button: " fmt
 
 #include <linux/kernel.h>
 #include <linux/module.h>

drivers/acpi/ec.c

···
 
 /* Uncomment next line to get verbose printout */
 /* #define DEBUG */
-#define pr_fmt(fmt) "ACPI : EC: " fmt
+#define pr_fmt(fmt) "ACPI: EC: " fmt
 
 #include <linux/kernel.h>
 #include <linux/module.h>

drivers/acpi/ioapic.c

···
  * registered when we parsed the ACPI MADT.
  */
 
-#define pr_fmt(fmt) "ACPI : IOAPIC: " fmt
+#define pr_fmt(fmt) "ACPI: IOAPIC: " fmt
 
 #include <linux/slab.h>
 #include <linux/acpi.h>