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Add optimize flag in GNU Arm Embedded Toolchain common setting in building system to decrease binary size
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According to the feedback from partners, the binary generated with GUMARM option is too large to fit in a vendor platform.
To fix the oversize issue, add the optimize flag -ffunction-sections and -fdata-sections into compiling flags and add flag -Wl,--gc-sections into linker flags. The binary size can be decreased to fit in the platform after the optimization.

It is a common challenge to control the binary size on resource limited IoT products.
Therefore, it can be necessary to add the optimize flags -function-sections, -fdata-sections and --gc-sections, into GNUARM settings in TF-M building system as a common and default configuration.

[1] [[ | -ffunction-sections ]]
[2] [[ | -fdata-sections ]]``
[3] [[ | --gc-sections ]]

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