bsps: Move libchip to bsps

This patch is a part of the BSP source reorganization.

Update #3285.

bsps/shared/dev/rtc/README.icm7170

@@ -0,0 +1,48 @@
+
+Configuration Table Use
+=======================
+
+sDeviceName
+
+   The name of this device.
+
+deviceType
+
+   This field must be RTC_ICM7170.
+
+pDeviceFns
+
+   The device interface control table.  This must be icm7170_fns.
+
+deviceProbe
+
+   This is the address of the routine which probes to see if the device
+   is present.
+
+pDeviceParams
+
+    This field specifies the clock frequency.  It may be one of the
+    following:
+        ICM7170_AT_32_KHZ
+        ICM7170_AT_1_MHZ
+        ICM7170_AT_2_MHZ
+        ICM7170_AT_4_MHZ
+
+ulCtrlPort1
+
+   This field is the base address of the RTC area of the chip.
+
+ulCtrlPort2
+
+   This field is ignored.
+
+ulDataPort
+
+   This field is ignored.
+
+
+getRegister
+setRegister
+
+   These follow standard conventions.
+