ldelf: support RISC-V

Add 64-bit RISC-V ldelf startup assembly and
parsing 64-bit ELF files.

Signed-off-by: liushiwei <liushiwei@eswincomputing.com>
Tested-by: liushiwei <liushiwei@eswincomputing.c

ldelf: support RISC-V

Add 64-bit RISC-V ldelf startup assembly and
parsing 64-bit ELF files.

Signed-off-by: liushiwei <liushiwei@eswincomputing.com>
Tested-by: liushiwei <liushiwei@eswincomputing.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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