mpq8064: Add support for GSBI6 UARTDM for Bluetooth feature

On MPQ8064 Hybrid and DTV variant with ASIC 1.0/1.1, Bluetooth is
connected to MSM externally through GSBI6 UARTDM interface. Hence
add GSBI6 UART device and required resources (its GPIOs, ADM
(Channel/CRCI), clocks ) and its configuration.

CRs-Fixed: 386832
Change-Id: I230357a92b7424fa24e4b77853330fe2893ed2eb
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
Signed-off-by: Saket Saurabh <ssaurabh@codeaurora.org>