p1: arm: s5pv210: another way to get machine name

P1 have 3 GSM variants and 1 CDMA: Total 4

  1. p1
  2. p1l
  3. p1n
  4. p1c

Then we have to do many calls to get machine confirmation

  machine_is_p1[x]()

So, It was fixed using that way.

Signed-off-by: Humberto Borba <humberos@gmail.com>