Blackfin arch: fix bug - kernel build fails with undefined reference to pm_overflow_handler

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/Kconfig

@@ -1018,7 +1018,7 @@ config EBIU_FCTLVAL
 
 config HARDWARE_PM
 	bool "OProfile use hardware porformance monitor"
-	depends on OPROFILE
+	depends on OPROFILE=y
 	default n
 
 endmenu