isa1200: Add support for pwm clk

PWM generation mode needs clk to generate internal PWM
for vibration. Add clk apis to enable/disable clock as
needed.

Change-Id: I2ba591509fc899186bf0ad7069133a9f1d0e6a42
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>
diff --git a/include/linux/i2c/isa1200.h b/include/linux/i2c/isa1200.h
index 9dab3eb..ffadf96 100644
--- a/include/linux/i2c/isa1200.h
+++ b/include/linux/i2c/isa1200.h
@@ -49,6 +49,7 @@
 	bool smart_en; /* smart mode enable/disable */
 	bool is_erm;
 	bool ext_clk_en;
+	bool need_pwm_clk;
 	unsigned int chip_en;
 	unsigned int duty;
 	struct isa1200_regulator *regulator_info;