freedreno/rnn: Fix reg names for regs with variants
Fixes reg names with headergen2, so that if we have separate a6xx and a7xx variants for a register we get REG_A6XX_foo and REG_A7XX_foo instead of both being REG_A6XX_foo. Otherwise generated headers for the kernel wouldn't compile.
Signed-off-by: Rob Clark robdclark@chromium.org