Android: custom-fixing support for multiple BTLE devices on stock android sources

It is required to adapt the original Android source code (targeted at Nexus4 device) to support Bluetooth 4.0 BTLE proximity devices. Current Bluedroid BTLE implementation is limited to seven maximum bonded devices simultaneously. This derives from a Bluetooth 2.0 limitation. Starting from BT4.0/BTLE no bonded devices limit should be. Instead, we need to address this limit and increase the maximum number of bonded devices to at least 40. The object of this project is to edit the Nexus 4 source code (bluedroid, kernel driver, java library) to raise the original android limitation. Preserving Bluetooth functions before 4.0 is not required. The goal is to rebuild a customized Nexus4 ROM image to support our specific BTLE proximity devices only, with respect to the removed limit of 7 bonded devices.