USBMSD example using an SD card

Dependents:   USBMSD_SD_HelloWorld_FRDM-KL25Z USBMSD_SD_HelloWorld_Mbed USBMSD_SD_HelloWorld_FRDM-KL25Z V09_01h ... more

Update USBMSD_SD to Reflect Latest Changes in USBMSD

This PR updates USBMSD_SD to reflect the latest changes in USBMSD, specifically the functions disk_read and disk_write

Fork of USBMSD_SD