ath9k_hw: Enable generic timer interrupt.

Generic timer interrupt was not triggered unless autosleep was
disabled. Since autosleep is enabled in the newer chipsets,
enable generic timer for using with bt coex logic.
Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/mac.c

@@ -885,6 +885,9 @@ void ath9k_hw_set_interrupts(struct ath_hw *ah, enum ath9k_int ints)
 			mask |= AR_IMR_GENTMR;
 	}
 
+	if (ints & ATH9K_INT_GENTIMER)
+		mask |= AR_IMR_GENTMR;
+
 	if (ints & (ATH9K_INT_BMISC)) {
 		mask |= AR_IMR_BCNMISC;
 		if (ints & ATH9K_INT_TIM)