dragon: power: update GPU boost parameters

pstate: 0xb -> 0x6
duration: 40ms -> 2000ms

BUG=24682588
TEST=run Chrome overflow menu render jank test and observe systrace

Change-Id: I746d2cafb7ef6116eba0ad786660f905e3eb1e22
diff --git a/power/power_dragon.cpp b/power/power_dragon.cpp
index d65411e..f842d13 100644
--- a/power/power_dragon.cpp
+++ b/power/power_dragon.cpp
@@ -47,8 +47,8 @@
 #define LOW_POWER_MAX_FREQ "1020000"
 #define NORMAL_MAX_FREQ "1912500"
 #define GPU_BOOST_PATH "/sys/devices/57000000.gpu/pstate"
-#define GPU_BOOST_ENTER_CMD "0b,0C"    // boost GPU to work at least on 0b - 844MHz
-#define GPU_BOOST_DURATION_MS 40
+#define GPU_BOOST_ENTER_CMD "06,0C"    // boost GPU to work at least on 06 - 460MHz
+#define GPU_BOOST_DURATION_MS 2000
 #define GPU_BOOST_EXIT_CMD "auto"
 #define GPU_FREQ_CONSTRAINT "852000 852000 -1 2000"