msm: A1 has 11 MTD partitions
acer_smem: Allow enabling debug UART

By default MODEM CPU does not write logs to UART. This patch allows enabling the
log to serial console by setting /sys/kernel/debug/acer_smem/uart_log_switch to
ACER_UART_LOG_TO_UART3. Setting UART1 crashes the device though.
Debug: Enable MSM_DEBUG_UART3

Update board file to support passing the serial port offset, update
defconfig.
HACK: Always assume USB SDP connection

My USB3.0 cable seems to have ID pin floating and this switches USB to LPM.
This means that USB subsystem will be powered on when a wall-charger is
connected.

See https://rtg.in.ua/2013/07/01/serial-debug-on-acer-a1/