isl9238: Enable system power monitor function

The system power monitor function, aka. PSYS, of the ISL9238 chip
is disabled by default, this patch enables PSYS monitor in the
EC driver.

BUG=b:62041842
BRANCH=none
TEST=Able to read non-zero value at the MSR of
MSR_PLATFORM_ENERGY_STATUS (0x64D) by iotools;
Also, kernel powercap driver probes PSYS domain correctly;
Such that the kernel exports the sysfs node of intel-rapl:1

Change-Id: I7a533032815e873ae74dca42ec07041be0d0f975
Signed-off-by: Harry Pan <harry.pan@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/520549
Tested-by: Kane Chen <kane.chen@intel.com>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
diff --git a/board/fizz/board.h b/board/fizz/board.h
index ffa5bb2..25f2136 100644
--- a/board/fizz/board.h
+++ b/board/fizz/board.h
@@ -61,6 +61,7 @@
 
 #define CONFIG_CHARGER_ISL9238
 #define CONFIG_CHARGER_INPUT_CURRENT 512
+#define CONFIG_CHARGER_PSYS
 #define CONFIG_CHARGER_SENSE_RESISTOR 10
 #define CONFIG_CHARGER_SENSE_RESISTOR_AC 20
 #define CONFIG_CMD_CHARGER_ADC_AMON_BMON
diff --git a/board/poppy/board.h b/board/poppy/board.h
index bbaa65a..587b35f 100644
--- a/board/poppy/board.h
+++ b/board/poppy/board.h
@@ -86,6 +86,7 @@
 #define CONFIG_CHARGER_MIN_BAT_PCT_FOR_POWER_ON 1
 #define CONFIG_CHARGER_NARROW_VDC
 #define CONFIG_CHARGER_PROFILE_OVERRIDE
+#define CONFIG_CHARGER_PSYS
 #define CONFIG_CHARGER_SENSE_RESISTOR 10
 #define CONFIG_CHARGER_SENSE_RESISTOR_AC 20
 #define CONFIG_CMD_CHARGER_ADC_AMON_BMON