fix(st7789): Remove gamma configuration, relying on defaults (#380)

Author: finger563

components/display_drivers/include/st7789.hpp

@@ -163,12 +163,6 @@ class St7789 {
         {(uint8_t)Command::rgbctrl, {0x00, 0x1B}, 2},
         {0xF2, {0x08}, 1},
         {(uint8_t)Command::gamset, {0x01}, 1},
-        {(uint8_t)Command::pvgamctrl,
-         {0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x32, 0x44, 0x42, 0x06, 0x0E, 0x12, 0x14, 0x17},
-         14},
-        {(uint8_t)Command::nvgamctrl,
-         {0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x31, 0x54, 0x47, 0x0E, 0x1C, 0x17, 0x1B, 0x1E},
-         14},
         {(uint8_t)Command::caset, {0x00, 0x00, 0x00, 0xEF}, 4},
         {(uint8_t)Command::raset, {0x00, 0x00, 0x01, 0x3f}, 4},
         {(uint8_t)Command::ramwr, {0}, 0},