bsp: cvitek: riscv: use marco for linker script

Regarding link script, some memory offsets and sizes are different
between the standard version and the smart version (such as
"__STACKSIZE__", kernel start address, kernel memory size, etc.).
Original solution is replacing link scripts and use INCLUDE,
which is relatively complicated.

This improvement uses macros to replace constants in the link
script. The preprocessing mechanism provided by gcc is used
to dynamically replace constant values during the build process.

In addition, the kernel load address (the corresponding
KERNEL_VADDR_START for smart) was originally configured as
0xFFFFFFC000200000, which is default value of riscv with
kernelmap enabled (0xffffffc000000000) plus offset to skip over
bootloader (0x200000). This caused a trouble: due to
default bsp configuration is for smart, if we switched to the
standard version and build, and then switched back to the smart
version, the value of KERNEL_VADDR_START will be default back to
0xffffffc000000000, which is different from the original configuration
value, resulting in the need to manually reconfigure it, which
is easy to forget and cause problems.

The current solution is to use the default value
0xffffffc000000000 in the configuration. Add offset to the code
and link script when using it.

This patch update the default .config and rtconfig.h for cv18xx_riscv.

Signed-off-by: Chen Wang <[email protected]>

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