tools: add gpt2env

This tool generates the gpt table with env format which
can be used in U-Boot by command:
gpt write mmc 0 $partitions
gpt verify mmc 0 $partitions

Usage:
./tools/gpt2e

tools: add gpt2env

This tool generates the gpt table with env format which
can be used in U-Boot by command:
gpt write mmc 0 $partitions
gpt verify mmc 0 $partitions

Usage:
./tools/gpt2env -i parameter.txt -o gpt_env.txt

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: Ib7ec33ac3d19fa8a1874c1b20526516b0d9f6006

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