arm64: signal: include asm/exception.h

The do_notify_resume() is in a header that is not included
for the definition, which causes a W=1 warning:

arch/arm64/kernel/signal.c:1280:6: error: no previous prototype for 'do_notify_resume' [-Werror=missing-prototypes]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20230516160642.523862-14-arnd@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

arch/arm64/kernel/signal.c

@@ -23,6 +23,7 @@
 #include <asm/daifflags.h>
 #include <asm/debug-monitors.h>
 #include <asm/elf.h>
+#include <asm/exception.h>
 #include <asm/cacheflush.h>
 #include <asm/ucontext.h>
 #include <asm/unistd.h>