msm: timer: add stub function for msm_timer_get_sclk_time

This function is used in drivers shared across 8960 and 8974, so provide
a stub function to allow it to compile.

Change-Id: Ifc6cfe051c121726ddb6ef5ea62e874d34c75501
Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
diff --git a/arch/arm/mach-msm/timer.h b/arch/arm/mach-msm/timer.h
index 7da9e6a..368dd7b 100644
--- a/arch/arm/mach-msm/timer.h
+++ b/arch/arm/mach-msm/timer.h
@@ -26,5 +26,6 @@
 #else
 static inline int64_t msm_timer_enter_idle(void) { return 0; }
 static inline void msm_timer_exit_idle(int low_power) { return; }
+static inline int64_t msm_timer_get_sclk_time(int64_t *period) { return 0; }
 #endif
 #endif