riscv: convert the t-head pbmt errata to use the __nops macro

Instead of manually inserting the list of nops, use the recently
introduced __nops(n) macro to make everything more readable.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
1 file changed