sunxi-tools: bump to latest git revision

sunxi-tools: bump to latest git revision

Major changes since v1.3:
- A64/A80 support
- H3 fel speedup
- Fel readl/writel/sid/reset64 commands
- Fel progress bar support
- Nand-image-builder tool
- Linaro toolchain compatibility workaround
- Portability fixes

The build system has been reworked somewhat and extra compiler flags now
have to be passed in EXTRA_CFLAGS instead of CFLAGS, so we cannot use
{TARGET,HOST}_CONFIGURE_OPTS.
Instead explicitly pass the needed variables (CC and LDFLAGS).

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>