ARM: spear: include "pl080.h" for pl080_get_signal() prototype

pl080_get_signal() and pl080_put_signal() are declared in pl080.h
and defined in pl080.c, but this file is missing an include
of the header:

arch/arm/mach-spear/pl080.c:27:5: error: no previous prototype for 'pl080_get_signal'
arch/arm/mach-spear/pl080.c:62:6: error: no previous prototype for 'pl080_put_signal'
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20230516153109.514251-13-arnd@kernel.orgSigned-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-spear/pl080.c

@@ -16,6 +16,7 @@
 #include <linux/spinlock_types.h>
 #include "spear.h"
 #include "misc_regs.h"
+#include "pl080.h"
 
 static spinlock_t lock = __SPIN_LOCK_UNLOCKED(x);