[RCARGEN3] Update Renesas Rcar Gen3 BSP to 3.7

[RCARGEN3] Update Renesas Rcar Gen3 BSP to 3.7

Tested with agl-demo-platform image on:
  * M3+KF
  * H3+KF

Test results:

| Component                                               |  Status    |
|---------------------------------------------------------|------------|
| Wifi (U52)                                              | ok         |
| BT HCI (U52)                                            | ok         |
| BT Audio(U52)                                           | not tested |
| USB2.0(host)(CN13)                                      | not tested |
| USB2.0(func)(CN13)                                      | not tested |
| USB2.0(on-the-go)(CN13)                                 | not tested |
| USB3.0(CN2)                                             | fail       |
| Multichan Audio(SSI3,4) hphone(CN 32,33) lineout(CN12)  | not tested |
| CSI : Expansion Board (CN10)                            | not tested |
| CSI : Expansion Board (CN11)                            | not tested |
| CSI : Raspberry Pi camera(CN48)                         | not tested |
| Video Input CMOS camera(CN29)                           | not tested |
| HDMI out(CN49)                                          | ok         |
| LVDS out(CN7)                                           | not tested |
| Radio (CN42, 43)                                        | ok         |
| Gyro, Accel                                             | ok         |
| GPS (CN16)                                              | ok         |
| Serial (CN4)                                            | not tested |
| CAN(CN17, 18)                                           | ok         |
| SD (CN47)                                               | fail       |
| Mini PCIe(CN15)                                         | not tested |
| M.2 key M (CN5)                                         | not tested |
| MOST (CN22)                                             | not tested |

Change-Id: I0779cd6440bf1e8fc958f127aee3c3979da603bb
Signed-off-by: Ronan Le Martret <ronan.lemartret@iot.bzh>