The short answer is no, HDL Coder does not support norm().
From the hardware perspective, the norm() function is a complicated function. It can involve taking a reciprocal, exponentiation, and absolute value, all on matrix values that could be real or complex numbers. Each of these operations involves tradeoffs (typically speed vs. area tradeoffs) when designing hardware to implement the function. HDL Coder customers typically will want control over the implementation of each of these sub-algorithms, so these sort of complicated algorithmic functions are not directly supported.
It appears straightforward to implement norm() in MATLAB code or in Simulink using basic blocks. This will give the designer full control over the hardware implementation of the algorithm.
