crownbay: add the .ucode section in the linker script

Previously the CPU microcode was compiled and linked into a normal
data section and its size was hardcoded in a header file. Now we
add a new section in the linker script dedicated for the microcode
so that we can use linker to calculate the microcode size for us.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
tnc: adopt the microcode in the .ucode section

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
tnc: remove hardcoded microcode size

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>