riscv: add ELF header definitions

Add RISC-V specific ELF header definitions in a new header
file to support ELF parsing for handling dynamic relocations.

We referred to u-boot/arch/riscv/cpu/start

riscv: add ELF header definitions

Add RISC-V specific ELF header definitions in a new header
file to support ELF parsing for handling dynamic relocations.

We referred to u-boot/arch/riscv/cpu/start.S to obtain the
definitions we need in OP-TEE.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>

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