build: ta: add RISC-V linker script

Sort out the common code compiled by TA,
abstract RISCV and ARM compile the common part of TA.

Signed-off-by: liushiwei <liushiwei@eswincomputing.com>
Reviewed-b

build: ta: add RISC-V linker script

Sort out the common code compiled by TA,
abstract RISCV and ARM compile the common part of TA.

Signed-off-by: liushiwei <liushiwei@eswincomputing.com>
Reviewed-by: chenchaokai <chenchaokai@eswincomputing.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>

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