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The supported MARVELL_PLATFORM list is updated to include the recently added
a80x0_puzzle platform (IEI Puzzle-M801).

Additionally building instructions are added for the GST ESPRESSObin-Ultra
board (1 GB, DDR4 RAM variant), which has been tested successfully and booted
TF-A on the board.
Signed-off-by: Luka Kovacic <luka.kovacic@sartura.hr>
Change-Id: Ie5724df27c1ee2e8f6a52664520579e872471e93