Adding ICM-20948

Dependencies:   IMU HighGAccel

Revision:
0:e56a9ab74495
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Fri Feb 01 00:27:29 2019 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#a8f0c33eaa2c52babff9655417c36f4b5edd54d7