Remove unneeded includes of registers.h

The registers.h file should only be included by code in the chip/ and
board/ directories.  Code outside those directories should not access
chip-specific registers.

(This change doesn't completely fix that, because
common/extpower_usb.c uses STM32-specific regs, but we'll fix that in
a separate CL.)

BUG=chrome-os-partner:18343
BRANCH=none
TEST=compile all platforms

Change-Id: Ic499f56690c38663083423b0593800161a68e6e9
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/64382
Reviewed-by: Vic Yang <victoryang@chromium.org>

common/chipset_haswell.c

@@ -11,7 +11,6 @@
 #include "console.h"
 #include "gpio.h"
 #include "hooks.h"
-#include "registers.h"
 #include "system.h"
 #include "timer.h"
 #include "util.h"

common/flash_common.c

@@ -10,7 +10,6 @@
 #include "flash.h"
 #include "gpio.h"
 #include "host_command.h"
-#include "registers.h"
 #include "shared_mem.h"
 #include "system.h"
 #include "util.h"

common/keyboard_8042.c

@@ -17,7 +17,6 @@
 #include "lpc.h"
 #include "power_button.h"
 #include "queue.h"
-#include "registers.h"
 #include "shared_mem.h"
 #include "system.h"
 #include "task.h"

core/cortex-m/watchdog.c

@@ -7,7 +7,6 @@
 
 #include "common.h"
 #include "panic.h"
-#include "registers.h"
 #include "task.h"
 #include "timer.h"
 #include "uart.h"