tools/ramdump: Update readme file for porting ramdump for a new board.
tools/ramdump: Update readme file for porting ramdump for a new board.

Signed-off-by: Vidisha Thapa <3d8bcdb46ae40344d12a5a0255e34cf386c7657a@samsung.com>
Co-authored by: sunghan-chang <sh924.chang@samsung.com>

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