ta: riscv: Add MCOUNT_SYM definition

With the -pg option, the compiler inserts a call to _mcount into every
function prologue. Add definition for MCOUNT_SYM so that the linker
creates the additional

ta: riscv: Add MCOUNT_SYM definition

With the -pg option, the compiler inserts a call to _mcount into every
function prologue. Add definition for MCOUNT_SYM so that the linker
creates the additional space for ftrace buffer.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Marouene Boubakri <marouene.boubakri@nxp.com>

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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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