Fixup Satisfaction75 bootprocess. (#12621)

- Use normal ChibiOS I2C driver.
- Move drawing code to housekeeping -- previously it was during matrix
  scan, which gets executed during bootmagic checks. However, bootmagic
  is invoked before QWIIC subsystem is enabled, which means I2C isn't
  configured yet. All I2C calls to the OLED fail with timeouts while
  bootmagic is being checked. Housekeeping ensures this is executed once
  the system has initialised and settled.
- QWIIC OLED driver: properly clear out OLED buffer when clearing screen.

keyboards/cannonkeys/satisfaction75/config.h

@@ -51,6 +51,18 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 /* define if matrix has ghost */
 //#define MATRIX_HAS_GHOST
 
+// I2C config
+#define I2C_DRIVER I2CD1
+#define I2C1_SCL_BANK GPIOB
+#define I2C1_SCL 6
+#define I2C1_SDA 7
+#define I2C1_SCL_PAL_MODE 1
+#define I2C1_SDA_PAL_MODE 1
+#define I2C1_TIMINGR_PRESC 0x00U
+#define I2C1_TIMINGR_SCLDEL 0x03U
+#define I2C1_TIMINGR_SDADEL 0x01U
+#define I2C1_TIMINGR_SCLH 0x03U
+#define I2C1_TIMINGR_SCLL 0x09U
 
 /* Set 0 if debouncing isn't needed */
 #define DEBOUNCE    5