arm-trusted-firmware-mvebu: update a3700-tools to current master

arm-trusted-firmware-mvebu: update a3700-tools to current master

2efdb10 wtmi: Fix calculation of UART divider
4247e39 fix: twin die ddr porting guide
8ad7992 sys_init: Add missing newlines in debug mode
4ddea19 avs: Validate VDD value from OTP
c444aeb avs: Fix description for avs value 0x2e
1915b78 tim: Optimize code generated by gettimver.sh and print newline
21f566d tim: Print mv_ddr version and configuration on UART
840b70b tim: Use variable $DDRFILE where possible
c10e6ae tim: Fix waiting for UART TX ready
7bf95cf wtmi: Wait 3ms for the TX on UART to be empty prior resetting TX FIFO
63e8433 wtmi: Add "dirty" suffix to git commit and rebuild sys_init.bin binary when VERSION changes
e949b58 wtmi: During setup clock phase print CPU and DDR speed
10376b5 wtmi: Flush output on UART after the '\n' character
509c647 Makefile: Check that specified DDR_TOPOLOGY option is valid

Signed-off-by: Andre Heider <a.heider@gmail.com>