Enable EFI capsule update features to be enabled by default also with all
dfu valid options for ZynqMP.

This feature was tested on Xilinx ZynqMP zcu104 board with defining
dfu_alt_info="mmc 0:1=boot.bin fat 0 1;u-boot.itb fat 0 1"
and
dfu_alt_info="sf 0:0=boot.bin raw 0 0x50000;u-boot.itb raw 0x80000
0x500000".

There is a need to increase malloc size for getting dfu mmc to work.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
CC: Sughosh Ganu <sughosh.ganu@linaro.org>
CC: Ilias Apalodimas <ilias.apalodimas@linaro.org>
CC: Heinrich Schuchardt <xypron.glpk@gmx.de>