[WATCHDOG] fix watchdog/txx9wdt.c compilation

This patch fixes the following compile error caused by
commit 8dc244f7deac4c0e95ce0ffd26f494bb6e1534c0
([WATCHDOG 48/57] txx9: Fix locking, switch to unlocked_ioctl):

<-- snip -->

...
CC drivers/watchdog/txx9wdt.o
txx9wdt.c:48: warning: type defaults to 'int' in declaration of
txx9wdt.c:48: warning: parameter names (without types) in function
txx9wdt.c: In function 'txx9wdt_ping':
txx9wdt.c:52: error: 'txx9_lock' undeclared (first use in this function)
txx9wdt.c:52: error: (Each undeclared identifier is reported only once
txx9wdt.c:52: error: for each function it appears in.)
txx9wdt.c: In function 'txx9wdt_start':
txx9wdt.c:59: error: 'txx9_lock' undeclared (first use in this function)
txx9wdt.c: In function 'txx9wdt_stop':
txx9wdt.c:71: error: 'txx9_lock' undeclared (first use in this function)
make[3]: *** [drivers/watchdog/txx9wdt.o] Error 1

<-- snip -->

Reported-by: Adrian Bunk <[e-mail]>
Signed-off-by: Adrian Bunk <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/txx9wdt.c

···
 static int expect_close;
 static struct txx9_tmr_reg __iomem *txx9wdt_reg;
 static struct clk *txx9_imclk;
-static DECLARE_LOCK(txx9_lock);
+static DEFINE_SPINLOCK(txx9_lock);
 
 static void txx9wdt_ping(void)
 {