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Move doimage utility from toos/doimage to tools/marvell/doimage.
This is done for supporting mode Marvell tools in the future.
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>

HOSTCC should be used in any of the tools inside the tools/ directory
instead of CC. That way it is possible to override both values from the
command line when building the Trusted Firmware and the tools at the
same time. Also, use HOSTCCFLAGS instead of CFLAGS.

Also, instead of printing the strings CC and LD in the console during
the compilation of the tools, HOSTCC and HOSTLD have to be used for
clarity. This is how it is done in other projects like U-Boot or Linux.

Change-Id: Icd6f74c31eb74cdd1c353583399ab19e173e293e
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>

As these rules depend on non-existing headers as well (likely copy &
pasted from fiptool), they never matched, and the built-in rules were
used. That led to random breakages when e.g. CPPFLAGS was suddenly
evaluated and contained invalid options.

For the stm32image, this reveals that we were relying on the built-in
rules by passing -D_GNU_SOURCE via CPPFLAGS, rather than using CFLAGS as
used in the local rule. Fix that as well.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

Add Marvell "doimage" utility support.
The "doimage" utility allows to create flash images compatible
with Marvell BootROM image format. Additionally this tool
allows the flash image parsing and verification.

Change-Id: Ie8d7ccd0cc2978684e7eecb695f375395fc749ee
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>