HardwareSerial: add other configs than 8N1

[thomasfla]

the register configurations has been computed like this:

#include <stdio.h>
int main(int argc, char **argv)
{
    char t[24][4]={"5N1","6N1","7N1","8N1","5N2","6N2","7N2","8N2","5E1","6E1","7E1","8E1","5E2","6E2","7E2","8E2","5O1","6O1","7O1","8O1","5O2","6O2","7O2","8O2"};
    char c;
    int i;
    for (i=0;i<24;i++)
    {
        c=0;
        if (t[i][0]=='5') c+=0<<2;
        if (t[i][0]=='6') c+=1<<2;
        if (t[i][0]=='7') c+=2<<2;
        if (t[i][0]=='8') c+=3<<2;

        if (t[i][1]=='E') c+=2<<0;
        if (t[i][1]=='O') c+=3<<0;
        if (t[i][1]=='N') c+=0<<0;

        if (t[i][2]=='1') c+=1<<4;
        if (t[i][2]=='2') c+=3<<4;

        printf("#define SERIAL_%s 0x%x\n", t[i],c);
    }
    return 0;
}