start splitting up BMX055 into the three ICs in its package

drivers/sensor/bma255/Kconfig

@@ -0,0 +1,17 @@
+config BMA255
+	bool "BMA255"
+	default y
+	depends on DT_HAS_BOSCH_BMA255_ENABLED
+	help
+	  Enable driver for BMA255.
+
+if BMA255
+
+config BMA255_TRIGGER
+	bool "BMA255 trigger mode"
+	depends on BMA255
+	help
+	  Set to enable trigger mode using gpio interrupt, where
+	  interrupts are configured to line ALERT PIN.
+
+endif # BMA255